7.6 Exit poll and n Refer to the previous exercise.

a. In part

b, if the sampling distribution of the sample proportion had mean 0.409 and the standard deviation 0.008, give an interval of values within which the sample proportion will almost certainly fall. (Hint: You can use the approximate normality of the sampling distribution.)

b. The sample proportion for Whitman from the exit poll was 0.424. Using part

a, was this one of the plausible values expected in an exit poll? Why?