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A random sample of 64 observations produced a mean value of 73 and standard deviation of...

A random sample of 64 observations produced a mean value of 73 and standard deviation of 6.5. The 90% confidence interval for the population mean μ is between?

a) 69.663 and 76.337

b) 71.408 and 74.593

c) 71.663 and 74.337

d) 71.163 and 74.837

e) 72.163 and 73.837

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