A simple random sampleof students is selected, and the students are asked how much time they spent preparing for a test. The times in hrs. are as follows:
1.3 7.2 4.2 12.5 6.6 2.5 5.5
Based on these results, a confidence intervalfor the population meanis found to be u = 5.7 Plus or minus 4.4. Find the degree of confidence:
Since a confidence interval for the population mean is found to be u = 5.7 PLUS OR MINUS 4.4, we know that the margin of error is
Using Excel (you can do it by hand), we get the sample standard deviation s=3.6785 (see …
This solution shows step-by-step calculations to determine the degree of confidence based on the population mean.