# Question

Suppose we are using the sample size formula in the box on page 313 to find the sample size needed to make the margin of error in a confidence interval for p equal to E. In each of the following situations, explain what value of p would be used in the formula for finding n:

a. We have no idea what value p is— it could be any value between 0 and 1.

b. Past experience tells us that p is no more than .3.

c. Past experience tells us that p is at least .8.

a. We have no idea what value p is— it could be any value between 0 and 1.

b. Past experience tells us that p is no more than .3.

c. Past experience tells us that p is at least .8.

## Answer to relevant Questions

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