Question

A researcher surveys middle-school students on their study habits. She finds that in a random sample of 28 middle-school students, the mean amount of time that they spend working on the computer each night is 2.4 hours with a standard deviation of 0.92 hours. She uses the sample statistics to compute a 95% confidence interval for the population mean - the the mean amount of time that all middle-school students spend working on the computer each night.

What is the 95% confidence interval?

Answer 1

Anson Given mean X = 2.4 hours Standard deviation as 0.92 hours n = 28 To find the Con fidence interval at 95% We know that CI = x + Z. Je to at 95% confidence Level z= 1-96 0.92 CI - 2.4 + 1.96 CI = 2.4 + 2.4 + 0.341 CI - (24 - 0:34) 204 +0.341) g CI= ( 2.059, 2.741) .. CI = (20059, 26741)

Hence the solution...