Question

Construct a confidence interval using a sample of size 15, with a sample standard deviation of 1.45, a sample mean of 5.3, and a confidence level of 90%. Write your answer EXACTLY as is given by Excel. Do not round.

Answer 1

A confidence interval is the mean of the estimate plus and minus the variation in that estimate.

How to depict the confidence interval?

From the excel, Confidence.T(0.10,1.45,15)

Margin of error = 0.659414066

Lower limit will be;

= mean-0.659414066

= 5.3 - 0.659414066

= 4.640585934

Upper limit will be:

= mean+0.659414066

= 5.3+0.659414066

= 5.959414066

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