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Description: A researcher is interested in finding a 95% confidence interval for the mean number of times per day that college students text. The study included 117 students who averaged 35.4 texts per day. The standard deviation was 23.7 texts. Round answers to

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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A researcher is interested in finding a 95% confidence interval for the mean number of times per day that college students text. The study included 117 students who averaged 35.4 texts per day. The standard deviation was 23.7 texts. Round answers to 3 decimal places where possible.

a. To compute the confidence interval use a ? z t distribution.

b. With 95% confidence the population mean number of texts per day is between and texts.

c. If many groups of 117 randomly selected members are studied, then a different confidence interval would be produced from each group. About percent of these confidence intervals will contain the true population number of texts per day and about percent will not contain the true population mean number of texts per day.

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