Author Question: It is known that the population variance (2) is 144 . At 95 confidence, what sample size should be ... (Read 111 times)

bobypop · **on:** Jun 24, 2018

It is known that the population variance (2) is 144 . At 95 confidence, what sample size should be taken so that the margin of error does not exceed 5?
a. 22
b. 23
c. 24
d. 25

Question 2

Setting the upper and lower control limits in a control chart farther from the center line results in a
a. lower probability of a Type I error.
b. lower probability of a Type II error.
c. lower probability of both a Type I and Type II error.
d. higher probability of both a Type I and Type II error.