Refer to Exercise 6.50. In exercise a. Describe the populations to

Refer to Exercise 6.50.
In exercise
Refer to Exercise 6.50. 
In exercise
a. Describe the populations to

a. Describe the populations to which the inferences provided in Exercises 6.50€“6.52 are relevant.
b. A much larger study is to be designed to further examine the effectiveness of the high-dose level of the drug. How many rats would be needed in the new study to be 90% confident that an α = .05 test would detect a reduction of 10 mm Hg by the high-dose level relative to the mean blood pressure readings of the control group? Assume that the decreases in blood pressure for the high-dose and control groups have normal distributions with standard deviations of 30 mm Hg.
c. The company producing the drug wants a precise estimate of the mean reduction in the systolic blood pressure after injection with a high dose of the drug. What sample size is needed to obtain a 99% confidence interval having width of 5 mm Hg?

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