Statistics Unit 1 Challenge 1

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School

DeVry University, Keller Graduate School of Management *

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221

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Statistics

Date

Jan 9, 2024

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docx

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Uploaded by Cyntiann

Statistics Unit 1 Challenge 1.5 Evaluating Studies How about members of a local professional sports team who are conducting a survey? Which data collection method would provide biased results for the question "What is your favorite sport?"  a.) Ask people attending a concert.  b.) Ask people attending a soccer game.  c.) Ask people at a shopping mall.  d.) Ask people walking on the beach.  b.) Correct. Recall that bias is when the data collected differs systematically from the truth. 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. Kendra thinks it's important to know how much money her customers make, so she can decide whether to offer high-end items. Because Kendra’s shop is in a small town, most of her customers are her friends and neighbors. One survey question asks, “How much money do you make each month?” A customer who responds by writing down a really high number to impress Kendra is an example of ______ bias.  a.) selection  b.) response

 c.) non-response  d.) unintentional  c.) Incorrect. For it to be a non-response bias people would have to be excluded from the study or not agree to participate.  b.) Correct. Since Kendra's customers come from a small town, there might be a predisposition for them to inform Kendra based on a desired outcome. This is a response bias. Customers were asked "Why didn't you buy anything?" when they left the store without making a purchase. A few customers seem surprised by this question and many answered by saying that they forgot their wallet at home. Customers lying about why they did not make a purchase is an example of _____ bias.  a.) non-response  b.) response  c.) selection  d.) deliberate

 b.) Correct. Since the bias was created from the responses of the customers, it is a response bias Tim mailed a lot of his surveys to married couples. However, he included only the name of the male spouse in the mailing address. As a result, Tim has systematically excluded the opinions of female spouses from his survey. Ideally, Tim would prefer to have a 50/50 split in male and female respondents in his sample. Based upon the above scenario, which of the following is TRUE?  a.) Tim sought to promote non-response bias in his survey.  b.) Tim sought to promote participation bias in his survey.  c.) Tim has uncovered deliberate bias in his methods.  d.) Tim has uncovered selection bias in his methods.  d.) Correct. This is an example of the study designer, Tim, not selecting all facets of the population. Female spouses have been excluded, so it is a selection issue. Select the example that represents self-selected sampling.  a.) Naomi asks the same survey question to everyone who comes to the restaurant.  b.)

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