One-tailed test to a two-tailed test
Explain how the power of a hypothesis test is influenced by each of the following. Assume that all other factors are held constant.
a. Increasing the alpha level from .01 to .05.
b. Changing from a one-tailed test to a two-tailed test.
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A sample of n = 16 individuals is selected from a normal population with a mean of µ = 48 and a standard deviation of s = 12. After receiving a treatment, the sample mean is found to be M = 52. Compute Cohen's d to evaluate the size of the t
The East Coast researcher decides to construct a two-sided 99% confidence interval. Which researcher will have the more precise estimate? State your reason for choosing your answer. It may help to imagine that the sample standard deviation will
Identify a pair of variables for which you would expect to see a strong correlation but not a cause-and-effect relationship. Suggest an explanation for the association.
The building and equipment are estimated to cost $1,200,000, and both the building and equipment will be depreciated over 10 years using the straight-line method.
Increasing the alpha level from .01 to .05. Changing from a one-tailed test to a two-tailed test.
A product sells for $135, variable costs are $100, and fixed costs are $68,000. If the selling price can be increased by 21% with a similar increase in variable costs, how many less units would have to be sold to earn $220,000?
Use a .05 significance level. Is this evidence that the average length of employment with the postal service has decreased from twenty years ago?
A company with monthly fixed costs of $300,000 expects to earn monthly operating income of $64,000 by selling 13,000 units per month. What is the company's expected unit contribution margin?
Identify which of the following are tax preferences: a) Seven percent of the exclusion associated with gains on the sale of certain small business stock. b) Exclusion on the receipt of property by gift or by inheritance.
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