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

question 97

Multiple Choice

A laptop battery lifespan follows a normal distribution with mean μ = 22 months and a standard deviation $\sigma$ = 6 months.To test the alternative hypothesis that μ < 22 with α = .01, 36 laptop batteries are randomly selected.Assuming that μ = 24, the probability of type II error is approximately ________.

• A)-.01
• B)2.33
• C)-4.33
• D)0.01
• E)0.00

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