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     single-sample t-test     independent samples t-test     related-samples t-test

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A:

Q: For a population with µ = 40 and σ = 8, what is the z-score corresponding to X = 34?

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