Question: 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 standard deviation of $12,557. Calculate a 91% confidence interval for the mean salary of computer scientists.

1. [$25,469 $68,163]
2. [$46,592 $47,040]
3. [$46,157 $47,475]
4. [$46,783 $46,849]
5. [$45,979 $47,653]

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