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# The Solution to Confidence Interval for Mean

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A sample of the math test scores of 35 fourth-graders has a mean of 82 with a standard deviation of 15.

Find the 95% confidence interval of the mean math test scores of all fourth-graders.

Find the 99% confidence interval of the mean math test scores of all fourth-graders.

Which interval is larger? Explain why.

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#### Solution Preview

Please see the attachments.

A sample of the math test scores of 35 fourth-graders has a mean of 82 with a standard deviation of 15.
Find the 95% confidence interval of the mean math test scores of all fourth-graders.
Find the 99% confidence interval of the mean math test scores of all fourth-graders.
Which ...

#### Solution Summary

Step by step method for t construction confidence interval for mean is discussed here. Excel template for each problem is also included. This template can be used to obtain the answers of similar problems.

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