Suppose we are testing the null hypothesis H0: ì = 20 and the alternative Ha: ì 20, for a normal population with ó = 5. A random sample of 25 observations are drawn from the population, and we find the sample mean of these observations is = 17.6. The P-value is closest to?

Question

Suppose we are testing the null hypothesis H0: ì = 20 and the alternative Ha: ì  20, for a normal population with ó = 5. A random sample of 25 observations are drawn from the population, and we find the sample mean of these observations is  = 17.6. The P-value is closest to?

A. 0.0668.
B. 0.0082. 
C. 0.0164.
D. 0.1336.

Kuai · Answer

Two tailed. = 0.0164 Left tailed = 0.0082