A process has a standard deviation of 20; values of 187, 182, 164, 190; and a mean of180. Calculate the 95% confidence limits.
A)142.3

Question

A process has a standard deviation of 20; values of 187, 182, 164, 190; and a mean of180. Calculate the 95% confidence limits.
A)142.3 < u < 192.6
B)144.4 < u < 199.6
C)158.2 < u < 198.6
D)150.4 < u < 190.6

Quizplus · Accepted Answer

If a process has a standard deviation of 20; the values of 187, 182, 164, 190; and a mean of180, the 95% confidence limits are 144.4 < u < 199.6. This is calculated by 180 - 1.96 x 10 < u < 180 + 1.96 x 10.

A Process Has a Standard Deviation of 20; Values of 187