A random sample of 20 observations selected from a normal population produced = 72.6 and s2 = 19.4.
a. Form a 90% confidence interval for μ.
b. Test H0: μ = 80 against Ha: μ < 80. Use α = .05.
c. Test H0: μ = 80 against Ha: μ ≠ 80. Use α = .01.
d. Form a 99% confidence interval for μ.
e. How large a sample would be required to estimate m towithin 1 unit with 95% confidence?
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