In a study of 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 reported in the article. It is reasonable to assume that the samples come from populations that are approximately normal. Firstborn 103 81 101 89 Secondborn 103 102 91 112 103 104 93 89 114 112 Can you conclude that there is a difference in mean IQ between firstborn and secondborn sons? Use the a=0.01 level of signigficance and the critical value method. 96 121 114 108 88 103

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