IQ scores from the general
population form a normal distribution with a m = 100 and s = 15.
However, data indicate that children’s intelligence may be affected if
their mothers have German measles during pregnancy. Using hospital records, a researcher obtained
a sample of n = 25 school children whose mothers all had German measles during
their pregnancies. The average IQ for
this sample was x̅= 94. Do
these data indicate that German measles have a significant effect on IQ? Test with p=.05.