The following data were obtained from a two-factor independent-measures experiment with n = 5 participants in each treatment condition. What is the F- value for the interaction/AxB effect B1 M 3T=15 M=6T=30 M=9T=45 SS = 28 B2 B3 A1 SS = 18 SS- 26
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- Which of the independent variables retains the strongest association with the number of children a respondent has when all other variables in the model are controlled? What is that association? Which has the weakest when other variables are controlled?The following results are from an independent-measures, two-factor study with n=5 participants in each treatment condition. Use a two-factor ANOVA with α=.05 to evaluate the main effects and the interaction.For each of the following research scenarios, indicate which type of t-test: one-sample, independent, or dependent is appropriate for the research scenario described. Give reason(s) as to why that type of t-test (one-sample, independent, or dependent) is appropriate for the research scenario. a. Dr. Lofgren was interested in the effects of stress on the ability to concentrate. He randomly assigned 20 participants to complete a lab-based stress task to induce stress and another 20 participants to a control condition where they spent time in the lab but didn’t experience stress induction. Both groups then completed a task requiring deep concentration to complete; the time it took to complete the task was recorded, with quicker completion times reflecting better ability to concentrate. Dr. Lofgren hypothesized that participants in the stress condition would have a poorer ability to concentrate (i.e., slower completion times). b. An all-women's college is interested in whether more of…
- A researcher conducts an independent-measures, two factor study with two levels of factor A and two levels of factor B, using a sample of n = 8 participants in each treatment condition. a. What are the df values for the F-ratio evaluating the main effect of factor A? b. What are the df values for the F-ratio evaluating the main effect of factor B? c. What are the df values for the F-ratio evaluating the interaction?The following data represents results from an experiment comparing 3 treatment conditions for the cure of boredom. Treatment 1 is doing schoolwork, Treatment 2 is watching tv, and Treatment 3 is spending time with friends. The following scores represent treatment effectiveness scores where higher values indicate that the treatment of boredom was effective and lower values indicate that the treatment of boredom was ineffective. Treatment 1 Treatment 2 Treatment 3 0 1 6 N= 12 1 4 5 GM= 3.00 0 1 8 3 2 5…The following data were obtained from a repeated- measures study comparing three treatment conditions. Conduct a hypothesis test to examine whether there was a significant treatment effect (alpha = .05, follow four-step procedure) Treatment Participant I II III P A 6 8 10 24 G = 48 B 5 5 5 15 ΣX2 = 294 C 1 2 3 6 D 0 1 2 3 T = 12 T = 16 T = 20 SS = 26 SS = 30 SS = 38
- A U.S. study published in The American Journal of Preventive Medicine compared state-level prevalence of firearm ownership in 2002 with state-level rates of firearm assault and firearm robbery in the subsequent year. The investigators found a positive association - meaning that states with higher prevalence of firearm ownership also tended to be the states with higher rates of firearm assault. Which design best describes this study? a)Observational cohort study b)Randomized trial c)Case-control study d)Ecological studyConsider the following 2 × 2 table from a hypothetical cohort study. Calculate the relative risk of CVD comparing those with high fasting glucose (≥126 mg/dL) with those with normal fasting glucose (<126 mg/dL) Serum fasting glucose Developed CVD Did not develop CVD Total ≥126 mg/dL (exposed) 125 325 450 <126 mg/dL (not exposed) 50 500 550 Total 175 825 1000 Group of answer choices 0.33 0.75 1.02 3.08 5.34A consumer advocacy group wanted to study whether different airline carriers differed in terms of their delayed flights. In particular, the researchers were interested in the relationship between p1, the proportion of Alpha Airlines flights that were delayed at least 15 minutes, and p2, the proportion of Beta Airlines flights that were delayed at least 15 minutes. A random sample of 1,000 Alpha flights and a separate random sample of 1,000 Beta flights found that 67 of the Alpha fights and 160 of the Beta flights were delayed at least 15 minutes. The conditions for inference were checked and verified. Does this set of samples provide strong evidence that Alpha Airlines has a smaller proportion of flights that are delayed at least 15 minutes than Beta Airlines, at the α = 0.05 significance level? Find the z-table here. A. The test statistic is z = –6.56 and the P-value ≈ 0. Since the P-value ≈ 0 < 0.05, there is not sufficient evidence that Alpha Airlines has fewer delayed…
- Based on the following graph of a 2x2 ANOVA study, there is likely an interaction. A) True B)FalseDowns and Abwender (2002) evaluated soccer players and swimmers to determine whether the routine blows to the head experienced by soccer players produced long term neurological deficits. In the study, neurological tests were administered to mature soccer players and swimmers and the results indicated significant differences. In a similar study, a researcher obtained the following data. Swimmers Soccer Players 10 7 8 4 7 9 9 3 13 7 7 6 12 a)Are the neurological test scores significantly lower for the soccer player than for the swimmers in the control groups? Use a one-tailed test with = .05. b)Compute the value of r² (percentage of variance accounted for) these data.A nutritionist compared the effectiveness of an online diet program to that of an inperson diet program. After three months, she compared the number of pounds of weight lost. The control group (in-person) lost a mean of 18.00 pounds (s = 14.50, n = 16) and the experimental group (online) lost 16.00 pounds (s = 13.30, n = 21). Use an alpha of .05, a two-tailed test, s2pooled = 191.19, and sM1−M2 = 4.5 to determine if there is a difference between the two programs.