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A sample of 64 lightbulbs has mean life of 400 hrs. The population σ = 32 hrs. T...
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A sample of 64 lightbulbs has mean life of 400 hrs. The population σ = 32 hrs. Test H₀: μ = 390 vs H₁: μ ≠ 390 at α = 0.05. Which is correct?
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