4. In general, decreasing the alpha level, (for example from .05 to .01), will a

Question

4. In general, decreasing the alpha level, (for example from .05 to .01), will

a. increase the likelihood of rejecting Ho and increase the risk of a Type I error

b. decrease the likelihood of rejecting Ho and increase the risk of a Type I error

c. increase the likelihood of rejecting Ho and decrease the risk of a Type I error

d. decrease the likelihood of rejecting Ho and decrease the risk of a Type I error

5. A Type II error means that a researcher has concluded that a treatment

a. has an effect when it really does have an effect

b. has no effect when it really does have an effect

c. has no effect when it really has no effect

d. has an effect when it really has no effect

Explanation / Answer

4)

alpha is type I error

option C) decrease the likelihood of rejecting Ho and decrease the risk of a Type I error is correct

5)

a type II error is incorrectly retaining a false null hypothesis (a "false negative").

Concluding that a treatment has no effect when it really does

option b) is correct

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