Answer:
The statistical power of a hypothesis test is the probability of detecting an effect, if there is a true effect present to detect. Power can be calculated and reported for a completed experiment to comment on the confidence one might have in the conclusions drawn from the results of the study.
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The answer is b) :) hope i helped!
Answer:

Step-by-step explanation:
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Open up the parentheses

Combine like terms

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Answer is c , got it right