In Exercises 5–16, use the listed paired sample data, and assume that the samples are simple random samples and that the differences have a distribution that is approximately normal. Two Heads Are...

In Exercises 5–16, use the listed paired sample data, and assume that the samples are simple random samples and that the differences have a distribution that is approximately normal.

Two Heads Are Better Than One Listed below are brain volumes (cm3 ) of twins from Data Set 8 “IQ and Brain Size” in Appendix B. Construct a 99% confidence interval estimate of the mean of the differences between brain volumes for the first-born and the second-born twins. What does the confidence interval suggest?

Extracted text: 1029 1281 1034 1079 1104 1160 1005 1439 First Born 1035 1051 1079 1027 1070 1173 1067 1347 1204 Second Born 963 1272 1100