In a study of the birth order and intelligence, IQ tests were given to 18- and 19-year old men to estimate the size of the difference, if any, between the mean IQs of firstborn sons and secondborn sons. The following data for 10 firstborn sons and 10 secondborn sons are consistent with the means and standard deviations necessary to conclude that the samples come from populations that are normally distributed. Firstborn:  104 82 102 96 129 89 114 107 89 103 Secondborn: 103 103 91 113 102 103 92 90 114 113 a. Construct a 90% confidence interval for the difference in mean IQ between firstborn and secondborn sons. b. Based on the confidence interval, is it reasonable to believe that firstborn sons and secondborn sons may have the same mean IQ   I need to know how to do this on a Ti84 Plus Thank you

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