Are you smarter than your older brother? In a study of birth order and intelligence, IQ tests were given to 18 and 19yearold men to estimate the size of the difference. if any, between the mean IQs of firstborn sons and secondborn sons. The following data for firstborn sons and secondborn sons are consistent with the means and standard deviations reported in the article. It is reasonable to assume that the samples come from populations that are approximater normal. Can you conclude that the mean IQ of firstborn sons is less than the mean IQ of secondborn sons? Let ul denote the mean IQ of firstborn sons. Use the (1 = 0.05 level and the critical value method with the table. Firstborn S4 100 109 117 S? 98 102 106 10? 90 Secondborn 120 112 113 81 111 85 99 88 100 98 Send data to Excel Part1 of6 State the appropriate null and alternate hypotheses. _Ll1