When you get a surprisingly low price on a productdo you assume that you got a really good deal or thatyou bought a low-quality product? Research indi-cates that you are more likely to associate low priceand low quality if someone else makes the purchaserather than yourself (Yan & Sengupta, 2011). In asimilar study, n = 16 participants were asked to ratethe quality of low-priced items under two scenarios:purchased by a friend or purchased yourself. Theresults produced a mean difference of M, = 2.6 andSS = 135, with self-purchases rated higher.a. Is the judged quality of objects significantly differentfor self-purchases than for purchases made byothers? Use a two-tailed test with a .05. Research has shown that losing even one night'ssleep can have a significant effect on performanceof complex tasks, such as problem solving (Linde& Bergstroem, 1992). To demonstrate this phenom-enon, a sample of n = 25 college students was givena problem-solving task at noon on one day and againat noon on the following day. The students were notpermitted any sleep between the two tests. For eachstudent, the difference between the first and secondscore was recorded. For this sample, the studentsaveraged M, = 4.7 points better on the first test witha variance of s² = 64 for the difference scores.a. Do the data indicate a significant change inproblem-solving ability? Use a two-tailed testwith α =.05.

We have to conduct t test for testing the difference in mean of paired data.

Research has shown that losing even one night's sleep can have a significant effect on performance of complex tasks, such as problem solving (Linde & Bergstroem, 1992). To demonstrate this phenom- enon, a sample of n = 25 college students was given a problem-solving task at noon on one day and again at noon on the following day. The students were not permitted any sleep between the two tests. For each student, the difference between the first and second score was recorded. For this sample, the students averaged M, = 4.7 points better on the first test with a variance of s² = 64 for the difference scores. a. Do the data indicate a significant change in problem-solving ability? Use a two-tailed test with a

Research has shown that losing even one night's sleep can have a significant effect on performance of complex tasks, such as problem solving (Linde & Bergstroem, 1992). To demonstrate this phenom- enon, a sample of n = 25 college students was given a problem-solving task at noon on one day and again at noon on the following day. The students were not permitted any sleep between the two tests. For each student, the difference between the first and second score was recorded. For this sample, the students averaged M, = 4.7 points better on the first test with a variance of s² = 64 for the difference scores. a. Do the data indicate a significant change in problem-solving ability? Use a two-tailed test with a

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section: Chapter Questions

Problem 8CR

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