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SCENARIO: A researcher believes exercise may affect anxiety in women, but research appears inconclusive. She identifies a group of women (N=-30) who had not exercised.
SCENARIO: A researcher believes exercise may affect anxiety in women, but research appears inconclusive. She identifies a group of women (N=-30) who had not exercised. before, but are now planning to begin exercising. She gives them a 50-item anxiety. inventory before they begin exercising and administers it again after 6 months of exercising. .The anxiety inventory is measured on an interval scale and higher numbers. indicate higher anxiety. .In addition, scores on the inventory are normally distributed. The mean of the difference scores is 3.4, SD=1.8, and there were 30 in the sample. Using. this information, answer the following questions showing all work when calculations are. required to earn up to full credit. T 4) .Calculate the correlated-groups + test to determine the fobt. (Note you will first have to solve for the standard error of the difference-score). O Work: T MSD=301.81 ANSWER +-obtained:- SE=0.32861 tobt=10.34590 tobt=SEd-ud=0.32863.4-015)-Calculate the effect size using Cohen's d. Interpret it using the appropriate conventions- (small, medium, or large). Work:.Cohen's-d=SDd=1.89a ANSWER -.large 6).Is this a directional or non-directional study, and what is there? (Note you will have. to first calculate the dfja Work:1 degrees of freedom-df-n-1=30-19 df-29- ANSWER --directional study T tcv=1.6995 7).Calculate the.95% confidence intervals (make sure you use the two-tailed fev'). D Work: T a=1-0.95=0.057 ANSWER.tov=12.0459 df=291 Lower-Limit=2.739 tcv=12.045 Upper Limit=4.070 95%CI=3.4+2.045(0.3286)a 8) .Write an APA-style.Results section based on your analyses. All-homework."Results. sections"should follow the examples provided in the videos. Don't forget to include the- effect size, 'confidence interval, and a decision about the null hypothesis. ANSWER The observed effect-size is-1.89. This concludes that the magnitude of the- difference between the average and ud is large. The-95% confidence interval is between-2.73- and -4.07. not-including zero. Therefore the null hypothesis is rejected. The test statistic is- statistically significant with a difference in means of 3.4-and-a standard deviation of 1.8. There. is enough evidence to support the researcher's claim that exercise may affect anxiety in. women.0
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