In a study of the length of time that students require to earn bachelor’s degrees, 60 students are randomly selected and they are found to have a sample mean of 4.8 years and a sample standard deviation of 2.2 years, construct a 95% confidence interval estimate of the population mean.

Step-by-step explanation:

The  confidence interval to estimate the population mean is given by :_

Given : Sample size : n= 60 , the sample is a large sample (n>30), so we can apply z-test.

Sample mean =

Standard deviation :

Level of confidence:

Then, critical z-value =

Then, a 95% confidence interval estimate of the population mean will be

Hence, the  95% confidence interval to estimate the population mean = .

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step-by-step explanation:

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