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Question 6, Section 11.7 Exercise Homework: HWK #11 (Chapter 11) 20 HW Score: 71.75%, 5.02 of 7 points Part 1 of 2 Points: 0 of 1 Save A random sample of the amounts for 18 purchases was taken. The mean was $47.09, the standard deviation was $21.59, and the margin of error for a 95% confidence interval was $10.74. Assume that t -1 = 2.0 for the 95% confidence intervals. a) To reduce the margin of error to about $5, how large would the sample size have to be? b) How large would the sample size have to be to reduce the margin of error to $1.07 a) The new sample size should be (Round up to the nearest integer.) Help me solve this View an example Get more help - Clear all Check