Question: A random sample of 64 observations produced a mean value of 82 and standard deviation of 5.5. The 90% confidence interval for the population mean

A random sample of 64 observations produced a mean value of 82 and standard deviation of 5.5. The 90% confidence interval for the population mean is between

a) 81.86 and 82.14

b) 81.86 and 83.13

c) 80.87 and 83.13

d) 81.31 and 82.69

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