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Elementary Statistics | 12th Edition | ISBN: 9780321836960 | Authors: Mario F. Triola
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Confidence Intervals. In Exercise, construct

Chapter 7, Problem 18BSC

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QUESTION:

Confidence Intervals. In Exercises 9–24, construct the confidence interval.

Years in College Listed below are the numbers of years it took for a random sample of college students to earn bachelor's degrees (based on data from the National Center for Education Statistics). Construct a 90% confidence interval estimate of the mean time required for all college students to earn bachelor's degrees. Does the confidence interval contain the value of 4 years? Is there anything about the data that would suggest that the confidence interval might not be a good result?

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QUESTION:

Confidence Intervals. In Exercises 9–24, construct the confidence interval.

Years in College Listed below are the numbers of years it took for a random sample of college students to earn bachelor's degrees (based on data from the National Center for Education Statistics). Construct a 90% confidence interval estimate of the mean time required for all college students to earn bachelor's degrees. Does the confidence interval contain the value of 4 years? Is there anything about the data that would suggest that the confidence interval might not be a good result?

ANSWER:

Solution 18BSC

Step 1 of 3

The following data describes the number of years to earn bachelor’s degrees:

Picture 2

The objective is to construct 90% confidence interval estimate of the population mean.

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