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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Pure benzene has a normal freezing point of 5.50 degrees C. A solution containing 11.4 grams of a molecuar substance dissolved in 150.0 grams of benzene (kf = 5.12 degrees c/m) has a freezing point of 1.20 degrees celsius.
Two infinitely long, straight wires are parallel and separated by a distance of 1.30 meters. They carry currents in the same direction. Wire 1 carries four times the current that wire 2 carries.
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
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Explain how the power of a hypothesis test is influenced by each of the following. Assume that all other factors are held constant. Increasing the alpha level from .01 to .05. Changing from a one-tailed test to a two-tailed test.
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Suppose you hear an "old-timer" say, "Why, in my day, kids were much more respectful and didn't cause as much trouble as they do nowadays!" Formulate a hypothesis related to this statement that you could test. How would you test it?
If a car in this city needs major repair during its first year of purchase, what is the probability that it is made by manufacturer A?
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