Question: Margin of error and the confidence interval. A study based on a sample of size 30 reported a mean of 82 with a margin of

Margin of error and the confidence interval. A study based on a sample of size 30 reported a mean of 82 with a margin of error of 7 for 95% confidence.

(a) Give the 95% confidence interval.

(b) If you wanted 99% confidence for the same study, would your margin of error be greater than, equal to, or less than 7? Explain your answer.

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