Mathematics Homework Help

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.