(Answered) A simple random sample of 10 observations was taken from a

Statistics

A simple random sample of 10 observations was taken from a large normal population. The sample mean and the sample standard deviation were determined to be 80 and 12, respectively. A 95% population mean confidence interval is approximately ?

a) 71.4 to 88.6

b) 72.6 to 87.4

c) impossible to determine

d) 77.9 to 89.9

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