Three experiments investigating the relation between need for cognitive closure and persuasion were performed. Part of the study involved administering a "need for closure scale" to a group of students enrolled in an introductory psychology course. The "needfor closure scale" has scores ranging from 101 to 201. For the 85 students in the highest quartile of the distribution, the mean score was x = 178.90. Assume a population standard deviation of σ = 7.51. These students were all classified as high on their needfor closure. Assume that the 85 students represent a random sample of all students who are classified as high on their need for closure. Find a 95% confidence interval for the population mean score μ on the "need for closure scale" for all students with a highneed for closure. (Round your answers to two decimal places.)lower limitupper limit

The sample size is 85, sample mean is 178.90 and the population standard deviation is 7.51.

Answered: Three experiments investigating the…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Three experiments investigating the relation between need for cognitive closure and persuasion were performed. Part of the study involved administering a "need for closure scale" to a group of students enrolled in an introductory psychology course. The "need for closure scale" has scores ranging from 101 to 201. For the 71 students in the highest quartile of the distribution, the mean score was x = 177.10. Assume a population standard deviation of ? = 7.51. These students were all classified as high on their need for closure. Assume that the 71 students represent a random sample of all students who are classified as high on their need for closure. How large a sample is needed if we wish to be 99% confident that the sample mean score is within 2.2 points of the population mean score for students who are high on the need for closure?
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