The Lifetime of a Squirrel Follows a Normal Distribution with Mean

question 83

Multiple Choice

The lifetime of a squirrel follows a normal distribution with mean μ months and a standard deviation $\sigma$ =7 months.To test the alternative hypothesis that μ > 40, 25 squirrels are randomly selected.The null hypothesis is rejected when the sample mean is bigger than 43.Assuming that μ=45, the probability of type II error is approximately _________.

• A)0.076
• B)0.016
• C)0.05
• D)0.011
• E)0.983

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Definitions:

Contribution Margin

The amount remaining from sales revenue after all variable expenses have been deducted.

Photo-prints

Photographic images produced on paper or other substrates from digital or film originals.

Industrial Photo-finishing

Refers to the commercial process of developing and printing photographic images on a large scale, typically for businesses.

Contribution Margin Ratio

The percentage of each sales dollar that remains after variable costs are subtracted, indicating how much contributes towards fixed costs and profit.