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A sample of 200 observations is taken. The mean is 31.7 and the standard deviation is...

A sample of 200 observations is taken. The mean is 31.7 and the standard deviation is 1.8. Form a 90 percent confidence interval for the population mean.

[31.54 31.86]

[28.74 34.66]

[28.53 34.87]

[31.49 31.91]
Math   Statistics-And-Probability   
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