Drawing a black card from a well-shuffled standard deck of 52 cards.b.) Which data collection method would provide biased results for the question "What is your favorite sport? They are also all close to 74%, so they are accurate. The additional variables affect different control groups differently. 4.6 Investigational Product (s) This statement is TRUE since subjects are randomly assigned to treatment and control. Which of these situations best describes a retrospective observational Since the assignment is performed by the random process of drawing cards from a well-shuffled deck, this process describes randomization. ", Recall that bias is when the data collected differs systematically from the truth. Select the two categories that would yieldqualitativedata. An example might be a before-and-after trial. Youll have access to plenty of outdoor adventures when living in Kentucky. Please enter your email address. If your kiddo loves to collect rocks or hunt crawdads in the local creek, then theyre going to have a lot of fun living here. They arise due to errors in the measuring instruments used. The confidence interval is the mean value obtained from the sample and is equal to 7.2. The researcher should have control over exactly one variable. A cell phone company randomly called 200 customers and asked about customer satisfaction. When you start living in Kentucky, then youre going to be living close to many different forms of wildlife. Which of these represents aclosedquestion? Which of these actions would provide the best control for a mediating variable. Kendra's samples are accurate but not precise. What type of variable is voltage in the above situation? An owner of a local pizza shop offers two new toppings to see which sells the most at the end of the day. Kendra's measurements are precise but not accurate. Solved < Which of these situations best describes a | Chegg.com Which of these statements about a matched-pair design is FALSE? Since there was no active ingredient in the pill but Jennifer thought that her headache went away. Changing the number of coins used in an experiment involving coin tosses. Since no operations are performed, the data is simply raw data. In experimental design, recall that the control for the experiment is not assigned a treatment and confounding influences are controlled for so we can distinguish observable differences between groups. We can note that the interval runs from 6.3 to 8.1 when we add and subtract 0.9 from 7.2. Or move to Kentucky and recognize that the reason you want to move there is because of what Kentuckians have done. Kentuckys income tax rate is a flat 5% for everyone. There is a season for almost everything in the state, including river otter, squirrel, turkeys, and black bear. a. Which of these situations best describes a retrospective observational study? View the full answer Transcribed image text: < Which of these situations best describes a retrospective observational study? prices, the role of the national banking system (including its functions). Its also one of the few states where you can legally hunt elk and bobcat. )Repeating the same cancer treatment for 100 patients to get a larger sample.b. It is not that they couldn't be reached either, since their name could have been included in the address. MAT 300 Unit 1 Challenges Sophia Challenge 1 A survey on Internet usage was conducted among a group of 200 students in the school cafeteria. Which of these situations best describes randomization? Changing the number of coins used in an experiment involving coin tosses. Of the following choices, which two statements about the company's market shares are true? The benefit is the result of the fact that the "treatment" (coffee, although decaffeinated) contains another "active ingredient" besides caffeine. Drawing a black card from a well-shuffled standard deck of 52 cards. Tim has uncovered selection bias in his methods. Which of these situations best describes I think asking questions and collecting the information we want from our population sample is a good start. Since there is a random assignment of participants to both the treatment and control groups, in general, experiments can usually make strong cases for causality when analyzing the data. The confidence interval is the amount by which the sample mean is different from the true mean and is equal to 0.9. George hangs flyers for volunteers to answer questions for the survey on various streets and convenience stores throughout the city. Homework #1 Flashcards | Quizlet The researcher should have control over all of the variables. Kentucky provides you with an excellent centralized location. d) Repeating the same cancer treatment for 100 patients to get a larger sample. Experimenters can work with a sample that represents the population as a whole. Which statement about random errors is FALSE? This statement is FALSE because in the matched-pair design, the elements within the pair are assigned to different treatments. The experimental units are assigned randomly to one or more control groups and one or more treatment groups. The amount by which we expect the sample value to deviate from the true value is the 0.3. Kendra's samples are both accurate and precise. Get 5 free video unlocks on our app with code GOMOBILE. George asks every 10th customer to fill out a survey. The margin of error is the mean value obtained from the sample and is equal to 6.2. Which of these is an example ofsystematic randomsample? Which of the Following Best Describes a Situation in Which Elements are randomly selected from equal-sized blocks of the total population. Select the statement regarding cluster sampling that is FALSE. In this case, temperature is the explanatory variable because it is increasing between different junctions. How about members of a local professional sports team who are conducting a survey? You must login or register to add a new answer. Which of these situations best describes randomization? )Regulating the amount of sunlight that enters a greenhouse. The probability of every element being selected from the total population is the same. After the Revolutionary War, the United States was in desperate need of a monetary system. If you asked people at a soccer game what sport was their favorite when they are at a soccer game, we might expect that they systematically like soccer more than other sports. This is an example of a prospective study. Which of these situations best describes randomization? A bakery owner asked 150 customers to taste a new type of cookie and found that 60 people liked its taste. It is a sample in which every element has the same chance of being selected from the total population. Furniture sales rose by 31 percentage points. Drawing a black card from a well-shuffled standard deck of 52 cards. Regulating the amount of sunlight that enters a greenhouse. PDF Chapter 1 Test Review - Ms. Malone's Math Classes Which of the following situations is the best example of a coup d'etat? $100 in 1996 would have been worth $100 in 1995. There was no survey component since the researcher gathered the information without asking people in the study. Recall that descriptive statistics simply notes what we find in some sample. Dividing the population of New York into groups and then making simple random samples from those groups. Asking a group of kids to choose their favorite candy from a jar containing different candies. The tax code is beneficial for most households in Kentucky. The new value from 2015 is 450 students and the old value from 2014 is 500 students. A political party wins more seats in parliament after an election. b. A customer who responds by writing down a really high number to impress Kendra is an example of ______ bias. Terms of Use Market shares declined from 50 percent to 40 percent, so the absolute decrease can be found with the new value minus the old value: The percentage decrease is the percent change. D. A group of leaders forcefully overthrows the current government. Drawing a black card from a well-shuffled standard deck of 52 cards. There was a 20% decrease in market shares. Kendra's measurements are accurate but not precise. Which of the following is an advantage that is unique only toexperiments? D .The co-workers get a benefit from the "treatment" (coffee, although decaffeinated) since they also drink coffee at the coffee shop across the street during breaks. Regulating the amount of sunlight that enters a greenhouse. weeks, which type of statistical study would you be performing? The absolute difference, or absolute change, is new value minus old value. Choice 2: Since the question "Can I help you?" You can also enjoy the two largest human-made lakes that are east of the Mississippi River here. A sample of employees of online shopping websites, even if they shop online, would not be a representative sample of all online shoppers. Apr-2000 - Mar-2005, HOD ,Professor The type of pet (dog, cat, etc.) We can test out locations for a brick and mortar by moving our truck. They were merely attempts by whites to further subjugate blacks. In this experiment, closely matched elements are paired, and then one of them is put in the treatment group and the other in the control group. Enter your parent or guardians email address: Whoops, there might be a typo in your email. A nutritionist is studying the relationship between eating carbohydrates and gaining weight. There can be a systematic error and selection bias that occur at the same time. In a multiple-choice quiz, the total number of correct answers must be something like 0, 1, 2, etc. Challenge 3: Experiments | MyTopTutor The benefit is due to the fact that Jennifer was given the treatment (pill, although only a sugar pill) and not an effect of the "active ingredient" (headache medicine). Which of these represents abinomialquestion? These are the top three employers in the state. In the cluster sampling method, elements are randomly selected from the total population. Youll get the opportunity to learn more about how it is created as well, along with the science of what happens when creating it. Three hours later she was asked if she feels better, and she agreed she did. ), the age of the pet (2 years, 6 years, etc. please help, thanks :)) Q2 Practice Quiz 2 Stats Flashcards | Quizlet Samples might have elements of other bias as well as being a convenience sample. The elements are randomly allocated to treatment and control groups. Selecting every 20th person in a line of 200 moviegoers. $100 in 1991 would have been worth $100 in 1990. Since the researchers didn't account for the holiday weekend in the study, this would be considered a confounding variable. It also dropped in 2018 in 117 counties in the state from the previous year. This is an example of the study designer, Tim, not selecting all facets of the population. It is a sample where the population is divided into roughly equal groups, and then elements are randomly selected from each group. Which of the following is an example of a survey? Download link will automatically paste in the promo code on the sign up screen, Best Matched Videos Solved By Our Top Educators. 5.0 (7 reviews) Two study designs are described here. Recall the researcher wants to understand large cities across the country. Methods c. Control d. Validity C (Control is the term used for measures taken by the researcher to keep the conditions of a study uniform.) 40% of all the bakery's customers like the taste of the cookie. Unit 1, Challenge 3 Flashcards | Quizlet The confidence interval is the total number of subjects in the sample and is equal to 7.2. b) Regulating the amount of sunlight that enters a greenhouse. Almost done! Dont forget about the tasting samples that are available at most locations! 4. Market shares dropped by 20 percentage points. Toyota has facilities that operate in Erlanger and Georgetown. When hunting season rolls around, youll discover that there are more animals trying to cross the road while driving. Theres an excellent chance that you can afford a home when you start living in Kentucky. 1 / 9 Flashcards Learn Test Match Created by nikki_sharpe89 Terms in this set (9) Select the statement that expresses an approach used with experiments. 2. can only be expressed with numbers. Which of these describes a situation where science is used? All people who purchased a car from the car dealer represent the sample. Fans loving rooting for their favorite teams and will ask you about your support. The residents in the city are the sample. Lake Cumberland is another spot that youll love, and Otter Creek is a beautiful outdoor recreational area to enjoy. Repeating the same cancer treatment for 100 patients to get a larger sample. So they effectively have control over some conditions and variables in the study. Replace this sentence with a clear paragraph summarizing this categorys role in the war and how it changed because of the war (at least four complete sentences). Recall that in a randomized block design the experiment is run within each block. Sophia Unit 1 Challenge 3 - STATS 1001 - Stuvia US The only thing that worries the researcher is that she distributed the survey right before a holiday weekend, so she did not receive as many responses as she would have hoped. . Kentucky is one of the nine states that has a flat state income tax rate. If youre living in the south-central part of the state, then it means youll get a sliced pork shoulder topped with a pepper sauce, some vinegar, and bread that will soak up all of the liquid pretty quickly. You should George asks the same survey question to the first 20 customers to visit the food truck. and the color of the pet (brown, black, etc.) 25% of the chocolates manufactured in a factory are dark chocolates. The researcher should have control over some of the variables. Which of these situations best describes randomization? The absolute change is -266 residents and the relative change indicates a decrease of 5.8%. In this experiment, a sample is divided roughly into some groups and then some of the groups are randomly selected. Employees of the online shopping websites. Which of these situations best describes randomization? They can be eliminated if observations are repeated. In experimental design, recall that the control for the experiment is not assigned a treatment and confounding influences are controlled for so we can distinguish observable differences between groups. Percentage points is the absolute increase or decrease. Changes in 2018 shifted that amount to $31,110 a $10k decrease in the maximum allowed under the law. Which of the following is NOT an example of a survey? So the 35 people whose opinions are gathered and who attended the seminar are a representative sample. There was a 31% increase in furniture sales. SOPHIA LEARNING-INTRODUCTION TO STATISTICS-CHALLENGE-3 Experiments The new value from 2010 is 4,312 residents and the old value from 2000 is 4,578 residents. If you love winter, then there is enough snow most years to enjoy some cross-country skiing. Because of their realistic subject matter Which of the following best describes a situation in which one person must make a decision about what to do? a.) PDF Statistics 8: Chapters 7 to 10, Sample Multiple Choice Questions Which of these statements best describes a randomized block design experiment? A Decreases systematic bias. Subjects are randomly assigned to treatments. The margin of error is equal to 0.3 and the confidence interval is equal to 6.5. If you are moving to Kentucky from the west coast, then you will want to take the severe storm warnings seriously when living here. Then there is a thick smear of Mornay sauce that gets soaked into the Texas toast. Unit 1 Challenge 3 Q7.docx - Which Of These Situations Best Describes b. choose by alphabetical order. )It is a sample where the population is first broken into homogenous groups and then elements are randomly selected, in proportion, from each group. A. The benefit would be the fact that Julie had said she felt better. Everyone comes together to cheer on their favorite college teams as well. Housing costs in Kentucky are relatively affordable. Most communities are working towns here, so the people tend to have a focus on getting their to-do lists completed for the day. Tim sought to promote non-response bias in his survey. The next week, Kendra conducts an informal poll, asking every person that comes into the store if they prefer dogs to other animals. Which of these situations best describes a retrospective observational study? A design in which the total population is randomly divided into groups of equal size and a treatment is assigned to each group. There was a 9% increase in furniture sales. If we were to use that information to make broader inference, then it would be inferential. Market shares rose by 30 percentage points. Repeating the same cancer treatment for 100 patients to get a, Since this simply involves changing the number of coins in an experiment, this is, not random. The sample is divided into participants or subjects and then grouped by a variable of interest. Kendra's samples are neither accurate nor precise. There are numerous hunting seasons to enjoy in Kentucky. In 2015, there were 450 students enrolled in this particular course. Make sure that you see the Natural Bridge, which is a sandstone arch that formed in the area. This design has an advantage of controlling for variables that might confound the response. ! C.) Select the statement regarding cluster sampling that is FALSE. So the treatment and control would be done within the blocks. Prices, the costs associated with a decision, money, reduction policies, pollution Repeating the same cancer treatment for 100 patients to get a larger sample. So they are a sample. Therefore, these are examples of qualitative data instead of quantitative data. Select the example that representsself-selectedsampling. Kate plans to start a winter garment store. Observational Studies and Experiments Flashcards | Quizlet can only be put into categories and can only yield qualitative data. 1. Tornado warnings are no joke. Course Hero is not sponsored or endorsed by any college or university. Naomi posts a request for survey volunteers on the restaurant's Facebook page. So the absolute difference is: The relative change is the absolute difference divided by the initial value of 500 students: In 2011, there were 150 participants in a quiz competition. 25% of the chocolates in a box are dark chocolates. Youre going to need to learn the barbecue differences in the state. Visiting during this time of year is the perfect way to experience the state for the first time. Which of these random samples qualifies as a representative sample if studying the opinion of the attendees to a business seminar? They arise when the sample has some different characteristics than the population. The residents in the city are the population. Privacy Statement, Stuvia is not sponsored or endorsed by any college or university, Pennsylvania State University - All Campuses, Rutgers University - New Brunswick/Piscataway, University Of Illinois - Urbana-Champaign, Essential Environment: The Science Behind the Stories, Everything's an Argument with 2016 MLA Update, Managerial Economics and Business Strategy, Primates of the World: An Illustrated Guide, The State of Texas: Government, Politics, and Policy, IELTS - International English Language Testing System, TOEFL - Test of English as a Foreign Language, USMLE - United States Medical Licensing Examination, Sophia Unit 1 Challenge 3 Which of the following is an advantage that is unique only to experiments? a.) Experimenters can observe and record information of interest. b.) Experimenters can work wi. Drawing a black card from a well-shuffled standard deck of 52 cards. Increasing sample size will generally eliminate bias in a sample. Kentucky has some excellent jobs, low property costs, and the tax situation is favorable for most households. The following are the Consumer Price Index (CPI) for the years 1990-1992. 25% of the chocolates manufactured in a batch are dark chocolates. If youre a foodie, this could very well be a positive aspect of living in Kentucky because of the diversity of BBQ. Experimenters can reference sample data to draw inferences about the population. Kendra reads in Modern Dog Magazine that the average age of dogs currently alive is 4.8 years. Five students from each grade are asked what they would want as the mascot. Regulating the amount of sunlight that enters a greenhouse. With smaller samples however, random error can have a large effect. Which of these is true for the control group in an experiment? d.) Experimenters can work with a sample that represents the population as a whole. Since responders might all respond differently and can respond how they want, this would be an open question type. Experimenters can work with a sample that represents the population as a. Experimenters can use the data to draw cause and effect relationships. Repeating the same cancer treatment for 100 patients to get a larger sample.c.) Which of these statements best defines a stratified random sample? )Drawing a black card from a well-shuffled standard deck of 52 cards. There are several weeks of festivals, celebrations, and parties that lead up to the racing day. In the cluster sampling method, total population is roughly divided into groups based on location and a simple random sample of the groups is taken. A . This is simply the definition of the confidence interval. Here Naomi voluntarily enters the study. The Higher Education ranking measures college graduation rates, the costs of college and how attainable college is for Kentuckians. Which of these data sets representcontinuousdata? Sophia Unit 1 Challenge 3.docx - Sophia Pathways Unit 1 Select the example that representsconveniencesampling. A clinical researcher giving a medicine to a person and analyzing its effects. Their responses will most likely be different from those who decide not to voluntarily respond. You will get to enjoy the rivalry between Louisville and Kentucky. The experimental units are assigned randomly to exactly one control group and one treatment group. It is a way of life. Experimenters can observe and record information of interest. iPad. a. A design in which the total population is divided into homogeneous blocks and a treatment is assigned to every element of the block. Step 2: For each of your choices, write a paragraph summarizing its role in and changes from World War I. For the sample to be representative, it should be regarding those who attended the seminar since the purpose of the study is to understand the opinion of those who attended the seminar. )It is exposed to the factor under consideration and all other external influences are held constant.c. The absolute change is -266 residents and the relative change indicates a decrease of 6.2%. Recall that raw data is typically not previously available. Percentages are rounded to the nearest tenths place. Of the following choices, which two statements about furniture sales are true? In 2014, there were 500 students enrolled in a college course. Dividing the population into homogeneous groups and then sample is only one stage and is an example of stratified random sampling instead of multi-stage sampling. $100 in 1986 would be equivalent to $135 in 1993. Since Kendra's customers come from a small town, there might be a predisposition for them to inform Kendra based on a desired outcome. The total population is randomly divided into groups of equal size and a treatment is assigned to each group. So the treatment and control would be done within the blocks. Since you are simply recording information on the food truck environment without controlling anything, this approach is typical of observational studies. statistics unit 1 challenge 3.docx - Which of these situations best We want to convert from 1985 to 1992. You can still order it there today, or almost anywhere else in the state since it is considered one of the regions culinary treasures. Repeating the same cancer treatment for 100 patients to get a Since every 20th person is picked from a directory, it is systematic. The most popular procedure for randomly assigning participants to comparison groups is to _____. Although youre in a land-locked location, it doesnt take much to make it out to a local lake or take a day trip to a favorite spot. Market shares dropped by 25 percentage points. 25+ Pros and Cons of Living In Kentucky (Explained) This could be seen as a pro or a con, depending on your perspective. Every 50th person listed in a neighborhood directory was emailed and asked about their favorite genre of music. Since the amount spent on a pet can only be expressed with numbers, it is considered quantitative data. A complete discussion will include the type of commodity money used (and why commodity money Since the doctor went back in time and simply analyzed the medical history of a person without putting in any controls, this situation best describes a retrospective observational study.
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