A Laptop Battery Lifespan Follows a Normal Distribution with Mean $\sigma$

question 66

Multiple Choice

A laptop battery lifespan follows a normal distribution with mean μ = 20 months and a standard deviation $\sigma$ = 6 months.To test the alternative hypothesis that μ > 20 with α = .05, 36 laptop batteries are randomly selected.Assuming that μ = 21, the probability of type II error is approximately ________.

• A)0.00
• B)0.2595
• C)0.2036
• D)0.6449
• E)0.7405

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