Answer (Choose 1 answer)
A very large population has a mean of 93 and a standard deviation of 12. From the population, a random sample of 36 observations was selected with a sample mean of 90. What is the Z-score of the sample mean? Rounded to 4 decimal places.
A. -1.28
B. 2.326
C. 1.2812
D. -1.50
