For Exercises 51–58, do the following:

  1. State the hypotheses and the rejection rule.
  2. Calculate .
  3. Find the -value.
  4. State the conclusion and the interpretation.

Question 9.160

54. DDT in Breast Milk. Researchers compared the amount of DDT in the breast milk of 12 Latina women in the Yakima Valley of Washington State with the amount of DDT in breast milk in the general U.S. population.3 They measured the mean DDT level in the general population to be 47.2 parts per billion (ppb) and the mean DDT level in the 12 Latina women to be 219.7 ppb. Assume and a normally distributed population. Test whether the population mean DDT level in the breast milk of Latina women in the Yakima Valley is greater than that of the general population, using level of significance a .