PSY 230 Module 3 Assignment (A-3) For this assignment you will use multiple data sets, each embedded within the assignment below. Q1) Find the z values that form the boundaries of the critical region for a two-tailed test with α = .05 for each of the following sample size (n) values. a) n = 9 b) n = 16 c) n = 24 Q2)
PSY 230 Module 3 Assignment (A-3) For this assignment you will use multiple data sets, each embedded within the assignment below. Q1) Find the z values that form the boundaries of the critical region for a two-tailed test with α = .05 for each of the following sample size (n) values. a) n = 9 b) n = 16 c) n = 24 Q2) Although there is a popular belief that herbal remedies such as Ginkgo biloba and Ginseng may improve learning and memory in healthy adults, these effects are usually not supported by wellcontrolled research (Persson, Bringlov, Nilsson, & Nyberg, 2004). In a typical study, a researcher obtains a sample of n = 36 participants and has each person take the herbal supplements every day for 90 days. At the end of 90 days, each person takes a standardized memory test. For the general population, scores for the test are normally distributed with Population M = 80 and Population SD = 18. The sample of research participants had an average of M = 84. a) Identify the independent (IV) and dependent (DV) variables for this study. b) Use the information above to conduct a two-tailed hypothesis test using p = .05 as your alpha level. Be sure you complete all 5 steps of hypothesis testing and show your work/answers for each step. Q3) There is some evidence indicating that people with visible tattoos are viewed more negatively than people without visible tattoos (Resenhoeft, Villa, & Wiseman, 2008). To test this hypothesis, a researcher first obtained overall ratings of attractiveness for a woman with no tattoos shown in a color photograph. On a 7-point scale, the woman received an average rating of Population M = 4.9, and the distribution of ratings was normal with Population SD = 0.84. The researcher then modified the photo by adding a tattoo of a butterfly on the woman’s left arm. The modified photo was then shown to a sample of n = 16 students at a local university and the students used the same 7 –point scale to rate the attractiveness of the woman. The average score for the photo with the tattoo was M = 4.2 a) Would the researcher conduct a 1-tailed or 2-tailed hypothesis test? Explain why. b) Use the information above to conduct a hypothesis using p = .05 as your alpha level. Be sure you complete all 5 steps of hypothesis testing and show your work/answers for each step. c) Calculate a 95% confidence interval for the above sample. Q4) Childhood participation in sports, cultural groups, and youth groups appears to be related to selfesteem for adolescents (McGee, Williams, Howden-Chapman, Martin, & Kawachi, 2006). In a representative study, a sample of n = 100 adolescents with a history of group participation is given a standardized self-esteem questionnaire. For the general population of adolescents, scores on this questionnaire form a normal distribution with Population M = 40 and Population SD = 12. The sample of group participants has an average of M = 43.84. a) Would the commander conduct a 1-tailed or 2-tailed hypothesis test? Explain why. b) Use the information above to conduct a hypothesis test using p = .01 as your alpha level. Be sure you complete all 5 steps of hypothesis testing and show your work/answers for each step. c) Calculate a 99% confidence interval for the above sample. Extra Credit (3 points): In no less than 5 sentences, explain a research idea you would test using hypothesis testing. Be sure to identify your independent (IV) and dependent (DV) variables, and report your null and alternative hypotheses. Why are you interested in this particular research question?
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