Ha: σ2 < 25
α = .10
(b) H0: μ = 80 (With σ unknown and a sample size n = 36.)
Ha: μ > 80
α = .05
(c) H0: p1 – p2 = 0 (With sample sizes n1 = n2 = 60.)
Ha: p1 – p2 ¹ 0
α = .01
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