IQ scores from the general population form a normal distribution with a m = 100 ands = 15. However, data indicate that children's intelligence may be affected by early exposure to lead. Using hospital records, a researcher obtained a sample of n = 121 children who had lead exposure. The average IQ for this sample wasx= 96. Do these data indicate that exposure to lead has a significant effect on IQ? Test withp=.05.

How do I type out the null and alternative hypothesis in mathematical format?

What level of significance would be used?

What is the rejection region?

Calculate z