Question

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 75 students in the highest quartile of the distribution, the mean score was x = 175.30. Assume a population standard deviation of σ = 7.59. These students were all classified as high on their need for closure. Assume that the 75 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 high need for closure. (Round your answers to two decimal places.)

lower limit =

upper limit -

Answer 1

We need to construct the 95% confidence interval for the population mean μ. The following information is provided:

Sample Mean =	175.30
Population Standard Deviation (σ) =	7.59
Sample Size (N) =	75

The critical value for α=0.05 is . The corresponding confidence interval is computed as shown below:

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