Question 6.34

6.34 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.

  1. Give the 95% confidence interval.
  2. 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.