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Which of the following is not a way to increase the power of a t test?...

Which of the following is not a way to increase the power of a t test?

increase the difference between two means
increase the number of participants
decrease within-subject variance
increase the number of independent variables
Math   Statistics-And-Probability   
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Answer #1

we can increase power of a t test by increasing the difference between two means because bigger difference can be easily detected

Increasing the sampe size also increases the power of t test because larger sample size give more information related to population data

Decrease within subject variance also helps in increasing the power of t test because it decreases the standard deviation and improves the process

Increasing the number of independent variable does not have any effect on power

so, option D is correct answer

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