​A researcher selects a sample from a population with μ = 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?   Question  options: a. ​Decrease the sample variance b. ​Increase the sample mean c. ​Increase the sample size d. ​All of the other options will increase the likelihood of rejecting the null hypothesis

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