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A random sample of = 12observations from a normal population produced the following estimate: = 47.1 2= 4.7 Test the hypothesis 0: = 48 .

A random sample of = 12observations from a normal population produced the following estimate: = 47.1 2= 4.7

Test the hypothesis 0: = 48 . : 48 h = 0.01
Find a 90% confidence interval for the mean, and interpret this interval

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