10) A pilot sample of 75 items wastaken, and the number of items with the attribute of interest was found to be 15. How many more items must be sampled to construct a 95% confidence interval estimate for p with a 0.025 margin oferror?

An additional ________ items need to be sampled.

(Round up to the nearest wholenumber.)

****Hint: Be sure to start with the sample size for estimating the population proportion formula, where p is the value used to represent the populationproportion, e is the

desired margin oferror, and z is the critical value from a standard normal distribution for the desired confidence level.***

13) For each of the followingz-test statistics, compute thep-value assuming that the hypothesis test is aone-tailed test.

a. z=1.37

b. z=2.62

c. z=2.79

a. p-value=

b. p-value=

c. p-value=

(Round to four decimal places asneeded.)