Question: A researcher selects a sample from a population with = 30 and uses the sample to evaluate the effect of a treatment. After treatment, the

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. All of the other options will increase the likelihood of rejecting the null hypothesis

c. Decrease the sample variance

d.Increase the sample mean

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