Choose one. In a large population of adults, the mean IQ is 112 with standard deviation of 20. Suppose 200 adults are randomly selected for a market research campaign. The distribution of the sample mean IQ is:
a.) Exactly normal, mean 112, standard deviation 20
b.) Approximately normal, mean 112, standard deviation 20
c.) Approximately normal, mean 112, standard deviation 1.414
d.) Approximately normal, mean 112, standard deviation .1
a.) Exactly normal, mean 112, standard deviation 20
b.) Approximately normal, mean 112, standard deviation 20
c.) Approximately normal, mean 112, standard deviation 1.414
d.) Approximately normal, mean 112, standard deviation .1