1. Better late? An experimenter wished to determine whether there is a

relationship between children's IQs and their mothers' ages when they were born. Using school records, a list was compiled of 10-year-olds whose mothers were over 45, and a second list was compiled of 10-years-olds whose mothers were 30 or under. The experimenter randomly sampled 50 children from each list and administered the Standford-Binet intelligence test to them. The IQs were found to be considerably higher for the children of older mothers, and the difference was significant beyond the 0.001 level. The experimenter concluded that a woman should postpone childbearing until later in life to ensure a high IQ for her offspring. Comment on the appropriateness of the experimenter's conclusion.