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Are you smarter than your older brother? In a study of birth order and intelligence, IQ...
Are you smarter than your older brother? 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. Can you conclude that the mean IQ of firstborn sons is greater than the mean IQ of secondborn sons? Let μ1 denote the mean IQ of firstborn sons and μ2 denote the mean IQ of secondborn sons. Use the =α0.10 level and the P-value method with the table. Firstborn 106 116 116 112 130 123 130 103 128 109 Secondborn 107 120 123 111 102 104 125 95 100 98 Send data to Excel Part 1 of 6 Your Answer is correct State the appropriate null and alternate hypotheses. H0:=μ1μ2 H1:>μ1μ2 This is a ▼right-tailed test. Part: 1 / 61 of 6 Parts Complete Part 2 of 6 Compute the test statistic. Round the answer to three decimal places. =t
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