A random sample of 64 observations has a mean of 30. The population variance is assumed to be 9. The 85.3% confidence interval estimate for the population mean (to the third decimal place) is:
A)[28.369, 31.631].
B)[29.456, 30.544].
C)[28.560, 31.440].
D)[29.383, 30.617].

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The Answer of A random sample of 64 observations has a mean of 30. The population variance is assumed to be 9. The 85.3% confidence interval estimate for the population mean (to the third decimal place) is:
A)[28.369, 31.631].
B)[29.456, 30.544].
C)[28.560, 31.440].
D)[29.383, 30.617].

A Random Sample of 64 Observations Has a Mean of 30