Some bottles of bubble bath have gone past their expiration date. The employees want to know if the expired bubble bath produces a significantly different amount of bubbles. They know that a fresh bottle of bubble bath produces a 124 cubic inches (in3) of bubbles with a SD of 8 in3. After testing 16 bottles, they find the average expired bottle produces 130 in3 of bubbles. Imagine we KNOW that a treatment does not actually have an effect but the researcher concludes there is an effect. A) Why might a researcher make this error? a.The critical region is large enough to make a false positive. b.The effect is smaller than the study is powered for. c.The beta level was set too high. d.There is no error, it was a correct decision. B) How can we decrease this probability? a.Decrease alpha level. b. Increase alpha level. c.Increase power. d.Decrease power.
Some bottles of bubble bath have gone past their expiration date. The employees want to know if the expired bubble bath produces a significantly different amount of bubbles. They know that a fresh bottle of bubble bath produces a 124 cubic inches (in3) of bubbles with a SD of 8 in3. After testing 16 bottles, they find the average expired bottle produces 130 in3 of bubbles.
Imagine we KNOW that a treatment does not actually have an effect but the researcher concludes there is an effect.
A) Why might a researcher make this error?
a.The critical region is large enough to make a false positive.
b.The effect is smaller than the study is powered for.
c.The beta level was set too high.
d.There is no error, it was a correct decision.
B) How can we decrease this probability?
a.Decrease alpha level.
b. Increase alpha level.
c.Increase power.
d.Decrease power.
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