In a large population of college-educated adults, the mean IQ is 118 with a standard deviation of 20. Suppose 200 adults from this population are randomly selected for a market research campaign. 29. The distribution of the sample mean IQ is a. exactly normal, mean 118, standard deviation 20. b. approximately normal, mean 118, standard deviation 0.1. c. approximately normal, mean 118, standard deviation 1.414. d. approximately normal, mean equal to the observed sample mean value, standard deviation 20. 30. The probability that the sample mean IQ is greater than 120 is a. 0.0001. b. 0.0790. c. 0.1230. d. 0.9210.

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