3.Researchers compared the amount of DDT in the breast milk of a random sample of

12 Hispanic women in Yakima Valley in Washington State with the amount of DDT

in breast milk in the general U.S. population. They measured the standard deviation

of the amount of DDT in the general population to be 36.5 parts per billion (ppb).

Assume the population is normally distributed. We are interested in testing whether the population standard deviation of DDT level in the breast milk of Hispanic women in

Yakima Valley is greater than that of the general population, using level of significance

= :01.

(a) Specify appropriate null and alternate hypotheses.

(b) The sample variance is s2 = 119; 025. Calculate

(c) Calculate the p-value and compare it with . State your conclusion.

(d) Find the critical value and compare it with

State your conclusion.

(e) Construct a 95% confidence interval for the population variance.