11. Are you smarter than your older brother? In a study of birth order and intelligence, IQ tests were given to 18- and

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11 Are You Smarter Than Your Older Brother In A Study Of Birth Order And Intelligence Iq Tests Were Given To 18 And 1 (22.09 KiB) Viewed 22 times

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11 Are You Smarter Than Your Older Brother In A Study Of Birth Order And Intelligence Iq Tests Were Given To 18 And 3 (84.22 KiB) Viewed 22 times

11. Are you smarter than your older brother? In a study of birth order and intelligence, IQ tests were given to 18- and 2 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, buo l-bbs DX nga siis 25 upon E Firstborn 104 82 102 96 129Xogo bend 89 114 107 89 103 gladiola , បទ យ ,, nonton Secondborn 103 103 91 113 102 21103 92 90 114 113 cotta betul saidaitel ogniwo load Can you conclude that there is a difference in mean IQ between firstborn and secondborn sons? Use the a = 0.01 level. Based on data in Science 316:1717 DS 100 =

12. Recovering from surgery: A new postsurgical treatment was compared with a standard treatment. Seven subjects received the new treatment, while seven others (the controls) received the standard treatment. The recovery times, in days, are given below. 20. Treatment: 12 13 15 19 20 21 24 Control: 18 23 24 30 32 35 39 Can you conclude that the mean recovery time for those receiving the new treatment is less than the mean for those receiving the standard treatment? Use the a = 0.05 level. 13. Contaminated water: The concentration of benzene was measured in units of milligrams per liter for a simple random sample of five specimens of untreated wastewater produced at a gas field. The sample mean was 7.8 with a sample standard deviation of 1.4. Seven specimens of treated wastewater had an average benzene concentration of 3.2 with a standard deviation of 1.7. It is reasonable to assume that both samples come from populations that are approximately normal. Can you conclude that the mean benzene concentration is less in treated water than in untreated water? Use the a= 0.05 level of significance. a