Question: In a study of factors affecting soldiers’ decisions to reenlist, 320 subjects were measured for an index of satisfaction and the sample mean is 28.8 and the sample standard deviation is 7.3. Use the given sample data to construct the 98% confidence interval for the population mean.

1. [27.85 29.75]
2. [27.96 29.64]
3. [11.82 45.78]
4. [28.75 28.85]
5. [28.60 29.00]

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