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Why is it that the correct answer is E? What is the best explanation for the answer? Thanks

Why is it that the correct answer is E? What is the best explanation for the answer? Thanks

Algebra and Trigonometry (MindTap Course List)
Algebra and Trigonometry (MindTap Course List)
4th Edition
ISBN:9781305071742
Author:James Stewart, Lothar Redlin, Saleem Watson
Publisher:James Stewart, Lothar Redlin, Saleem Watson
Chapter14: Counting And Probability
Section14.CT: Chapter Test
Problem 4CT: Over the past year, John has purchased 30 books. a In how many ways can he pick four of these books...
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Why is it that the correct answer is E? What is the best explanation for the answer? Thanks

(A) It is not a well-designed experiment because employees were allowed to volunteer instead of being randomly selected. (B) It is not a well-designed experiment because only one new chair was used. At least two new treatments must be used. (C) It is not a well-designed experiment because each employee was assigned both treatments, and each employee should be assigned only one. (D) It is not a well-designed experiment because using a coin flip does not guarantee that fifteen employees will use each chair first. (E) It is a well-designed experiment because there is random assignment, replication, and comparison of at least two treatment groups.
Transcribed Image Text:(A) It is not a well-designed experiment because employees were allowed to volunteer instead of being randomly selected. (B) It is not a well-designed experiment because only one new chair was used. At least two new treatments must be used. (C) It is not a well-designed experiment because each employee was assigned both treatments, and each employee should be assigned only one. (D) It is not a well-designed experiment because using a coin flip does not guarantee that fifteen employees will use each chair first. (E) It is a well-designed experiment because there is random assignment, replication, and comparison of at least two treatment groups.
A local employer asked for help selecting a new type of desk chair. Thirty employees volunteered, and each employee used the new desk chair for two weeks and the current desk chair for two weeks. To determine which chair was used first, a coin was flipped for each employee. Heads represented using the new chair first, and tails represented using the current chair first. At the end of each two-week period, the employees were asked to rate their satisfaction with the new chair. Which of the following best describes this study?
Transcribed Image Text:A local employer asked for help selecting a new type of desk chair. Thirty employees volunteered, and each employee used the new desk chair for two weeks and the current desk chair for two weeks. To determine which chair was used first, a coin was flipped for each employee. Heads represented using the new chair first, and tails represented using the current chair first. At the end of each two-week period, the employees were asked to rate their satisfaction with the new chair. Which of the following best describes this study?
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Why is A incorrect? Will it not lead to voluntary response bias? How about B and C? Why are they incorrect? Thanks.

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