3. A study of persons (N = 1170) indicted for murder in Kentucky revealed that each had an average number of 1.69 prior felony arrests. The standard deviation was 2.6 (20 points).

a. Calculate the 95 percent confidence interval for this distribution and give a statement about what it represents.

b. Determine the z score for a murder defendant who had two prior felony arrests. Under the normal curve, what statement could you make about this z score?