Question: Problem 7.1 A random sample of size n = 20 from a normal distribution N(, 16) has mean x = 75. Find: (a) a 90%

Problem 7.1 A random sample of size n = 20 from a normal distribution N(µ, 16) has mean x = 75. Find:

(a) a 90% confidence interval for µ.

(b) a lower 90% confidence interval for µ.

(c) a 95% confidence interval for µ.

(d) a lower 95% confidence interval for µ.

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