Problem

A random sample of 20 observations selected from a normal population produced = 72.6 an...

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 H_a: μ < 80. Use α = .05.

c. Test H₀: μ = 80 against H_a: 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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Solutions For Problems in Chapter 6

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