A researcher selects a sample from a population with ?= 30 and uses the sample to evaluate the effect of a treatment. After treatment, the sample has a mean of M = 32 and a variance of s2 = 6 . Which of the following would definitely increase the likelihood of rejecting the null hypothesis?
a. Increase the sample size
b. Increase the sample mean
c. Decrease the sample variance
d. All of the other options will increase the likelihood of rejecting the null hypothesis.
D
Psychology
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