Question: 7. (15) A random sample of n = 12 observations from a normal population produced the following estimates: x = 47.1 and s 2 =

7. (15) A random sample of n = 12 observations from a normal population produced the following estimates: x = 47.1 and s 2 = 4.7.

(a) Test the hypothesis H0 : = 48 versus Ha : = 486 with = 0.1.

(b) What is the p-value for your test? p-value =

(c) Find a 90% confidence interval for the mean, and interpret this interval.

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