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Description: A researcher is interested in finding a 98% confidence interval for the mean number of times per day that college students text. The study included 137 students who averaged 28.3 texts per day. The standard deviation was 21.4 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 98% confidence interval for the mean number of times per day that college students text. The study included 137 students who averaged 28.3 texts per day. The standard deviation was 21.4 texts. Round answers to 3 decimal places where possible.

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

b. With 98% confidence the population mean number of texts per day is between _____ and _____ texts.

c. If many groups of 137 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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