In a random sample of 651 computer scientists who subscribed to a web-based daily news update, it was found that the average salary was $46,816 with a population standard deviation of $12,557. Calculate a 91 percent confidence interval for the mean salary of computer scientists.
A) [$25,469, $68,163]
B) [$46,592, $47,040]
C) [$46,157, $47,475]
D) [$46,783, $46,849]
E) [$45,981, $47,650]

Question

Quizplus · Accepted Answer

[± ] = [46,816 ± 1.695 (12,557/ 25.515)]
= [46,816 ± 834.18] = [45,981, 47,650]

In a Random Sample of 651 Computer Scientists Who Subscribed