17. Apsychologist is interested in studying the effectiveness of different thera
ID: 2947765 • Letter: 1
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17. Apsychologist is interested in studying the effectiveness of different therapies for depression. The psychologist selects 90 clients and cognitive-behavioral treatment, psychodynamic psychotherapy, or client-centered treatment. The dependent measure is a score on a depression inventory after 4 weeks of treatment. The psychologist wants to test the claim that all three therapies are equally effective in reducing symptoms of depression. randomly assigns to each of the following groups (a) Which statistical approach should be used? i. Confidence interval 11. t-test ii ANOVA iv. Chi square (b) Explain the rationale for your selection in (a). Specifically, why would this be the appropriate statistical approach? 18. A study was conducted to see whether monetary incentives to use less water during times of drought had an effect on water usage. Sixty single family homeowners were randomly assigned to one of two groups: 1) monetary incentives and 2) no monetary incentives. At the end of three months, the total amount of water usage for each household, in gallons, was measured. (a) What would be the appropriate hypothesis test to use to test the claim that monetary incentives reduce water usage? i. t-test for two independent samples ii. t-test for dependent samples iii z-test for population mearn (b) Explain the rationale for your selection in (a). Specifically, why would this be the appropriate statistical approach? 19. A researcher claims the proportion of auto accidents that involve teenage drivers is less than 20%. ABC Insurance Company checks police records on 400 randomly selected auto accidents and notes that teenagers were at the wheel in 64 of them. Assume the company significance level to test the researcher's claim wants to use a 0.05 What is the appropriate hypothesis test to use for this analysis? Please identify and explain why it is appropriate Identify the null hypothesis and the alternative hypothesis. Determine the test statistic. Round your answer to two decimal places. Describe method used for obtaining the test statistic Determine the p-value. Round your answer to three decimal places. Describe method used for obtaining the p-value Compare p-value and significance level ?. What decision should be made regarding the null (a) (b) (c) (d) (e)Explanation / Answer
17. The Psychologist randomly assigns 90 clients in the three groups of thirty.
The psychologist want to test the claim that wheather all the three therapies are equally effective for reducing the symptoms of depression we used
a) ANOVA test
Since The ANOVA test is used to compare multiple means.
18. a) The appropriate hypothesis test used to test the claim that monetary incentives reduce water usage we used:
t- test for two independent samples.
Since the sample are independently assigns in the two groups. And the sample size is small and the water usage of a households with monetary incentives does not depends upon the water usage of a households with no monetary incentives.
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