A researcher is examining whether daily exercise influences mood. The researcher assigns n = 12 individuals to exercise for three months and finds an average mood score of M = 22 with SS = 182 after three months for individuals in this group. A second group of n = 7 individuals assigned to a control group for the three months has a mood score of M = 19 with SS = 90. Which of the following is most consistent with the results of conducting a two-tailed independent-measurest test with a = .05? Ot= +2.12 and reject the null hypothesis Ot= +1.58 and reject the null hypothesis O t = +2.12 and fail to reject the null hypothesis Ot = +1.58 and fail to reject the null hypothesis

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