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A statistics practitioner calculated the mean and standard deviation from a sample of 51. The sample...

A statistics practitioner calculated the mean and standard deviation from a sample of 51. The sample mean is 120 and the sample standard deviation is 15. Estimate the population mean with 80% confidence.

[115.78, 124.22]

[117.27, 122.73]

[100.52, 139.48]

[116.48, 123.52]

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