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# A statistics instructor who teaches a lecture section of ISBN: 9780073401331 38

## Solution for problem 7E Chapter 6.5

Statistics for Engineers and Scientists | 4th Edition

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Problem 7E

A statistics instructor who teaches a lecture section of 160 students wants to determine whether students have more difficulty with one-tailed hypothesis tests or with two-tailed hypothesis tests. On the next exam, 80 of the students, chosen at random, get a version of the exam with a 10-point question that requires a one-tailed test. The other 80 students get a question that is identical except that it requires a two-tailed test. The one-tailed students average 7.79 points, and their standard deviation is 1,06 points. The two-tailed students average 7.64 points, and their standard deviation is 1.31 points.

a. Can you conclude that the mean score µ1 on one- tailed hypothesis test questions is higher than the mean score µ2 on two-tailed hypothesis test questions? State the appropriate null and alternate hypotheses, and then compute the P-value.

b. Can you conclude that the mean score µ1 on one- tailed hypothesis test questions differs from the mean score µ2 on two-tailed hypothesis test questions? State the appropriate null and alternate hypotheses, and then compute the P-value.

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##### ISBN: 9780073401331

This full solution covers the following key subjects: tailed, test, students, hypothesis, score. This expansive textbook survival guide covers 153 chapters, and 2440 solutions. The full step-by-step solution to problem: 7E from chapter: 6.5 was answered by , our top Statistics solution expert on 06/28/17, 11:15AM. Statistics for Engineers and Scientists was written by and is associated to the ISBN: 9780073401331. The answer to “A statistics instructor who teaches a lecture section of 160 students wants to determine whether students have more difficulty with one-tailed hypothesis tests or with two-tailed hypothesis tests. On the next exam, 80 of the students, chosen at random, get a version of the exam with a 10-point question that requires a one-tailed test. The other 80 students get a question that is identical except that it requires a two-tailed test. The one-tailed students average 7.79 points, and their standard deviation is 1,06 points. The two-tailed students average 7.64 points, and their standard deviation is 1.31 points.a. Can you conclude that the mean score µ1 on one- tailed hypothesis test questions is higher than the mean score µ2 on two-tailed hypothesis test questions? State the appropriate null and alternate hypotheses, and then compute the P-value.________________b. Can you conclude that the mean score µ1 on one- tailed hypothesis test questions differs from the mean score µ2 on two-tailed hypothesis test questions? State the appropriate null and alternate hypotheses, and then compute the P-value.” is broken down into a number of easy to follow steps, and 172 words. This textbook survival guide was created for the textbook: Statistics for Engineers and Scientists , edition: 4. Since the solution to 7E from 6.5 chapter was answered, more than 304 students have viewed the full step-by-step answer.

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