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. Assume that the samples come from normal populations.

firstbon

107.1 91 107.1 99.8 148.4

91.7 124.3 109.1 101.5 107.1

second born

109.2 104 101.9 122 107.1

107.1 102.1 91.8 116.3 122

Can you conclude that the standard deviation of IQ is greater for the firstborn than the secondborn? Let SD1 denote the standard deviation in the IQs of firstborn sons. Use the 0.01level.

Find the critical value. Round the answer to at least two decimal places.