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25 A developmental psychologist would like to determine how much impulsivity changes for children from age 3 to age 4. A random sample of n = 15 3-year-old children and a second sample of n = 15 4-year-olds are obtained. Each child is rated by her or his primary caregiver on a questionnaire, with higher scores indicating higher levels of impulsivity. The average score for the older children was M = 41.1 with SS=440 and the average for the younger children was M = 36.5 with SS = 410. Using these data answer the following. Which test is most appropriate for this situation? Z-score test O single-sample t-test O independent samples t-test related-samples t-test QUESTION 26 A sample of difference scores from a repeated-measures experiment has a mean of Mp = 5 with a variance of s² = 64. If the sample size is n = 4, what is the critical t-value if it is a two-tailed test with alpha = .05? 2.132 2.353 2.776 3.182 QUESTION 27 A sample of difference scores from a repeated-measures experiment has a mean of Mp = 5 with a variance of s² = 64. If the sample size is n = 4, which of the following most closely approximates the obtained t-value? O 0.27 O 1.00 O 1.25 O 1.75 QUESTION 28 A sample of difference scores from a repeated-measures experiment has a mean of Mp=5 with a variance of s² = 64. If the sample size is n = 4, what is the correct decision if using a two-tailed test with alpha = .05? O Accept the null hypothesis, there is a significant mean difference. O Accept the null hypothesis, there is not a significant mean difference. O Reject the null hypothesis, there is a significant mean difference. O Reject the null hypothesis, there is not a significant mean difference. 1 points 1 points 1 points Save Answer Save Answer Save Answer