210 F23 HW5 Lec 3

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Herzing University *

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320

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Psychology

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Dec 6, 2023

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Psych 210: Addington Fall 2023 Homework 5 (*7* points) Due Date: Monday, October 30 th by 4:00 PM at lecture Researchers studying children’s moral behavior have developed an altruism scale for 10-year- olds that reflects a child’s general level of helpfulness. Scores on the altruism scale are normally distributed with  = 95 and  = 14 (higher scores on the scale indicate a greater level of helpfulness). Dr. Thornton wants to investigate whether exposing children to a videotape that shows a lost puppy in need of help will affect how helpful they are. He selects a random sample of n = 36 10- year-olds, shows them the video, and then administers the altruism scale. Dr. Thornton finds that the mean score for the children is M = 99.1. Test whether Dr. Thornton’s manipulation significantly increases altruism scores. 1. State the null and alternative hypotheses in sentence format (do not use symbol notation). 2. State the null and alternative hypotheses using statistical notation. 3. Identify the critical region(s) for an  = .05 level of significance for this sampling distribution. 4. Did Dr. Thornton’s manipulation significantly increase altruism scores? Explain your answer. 5. Suppose that Dr. Thornton instead wants to test whether his manipulation has any effect on altruism scores. Assume that he uses the same 36 children as noted above. Restate the null and alternative hypotheses using symbol notation for this new test. 6. Identify the critical region(s) for an  = .05 level of significance for this sampling distribution. 7. Did Dr. Thornton find a significant effect of his manipulation? Explain why the answer here is different than that for (4), above.

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