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In: Statistics and Probability

A psychologist is interested in investigating whether people who never owned a pet are happier after...

A psychologist is interested in investigating whether people who never owned a pet are happier after getting a pet. A questionnaire about their level of happiness is administered to a group of 20 to 29 year-olds when they before they get a pet and after they get a pet. The data are below.

Before Pet

After Pet

10

15

9

9

11

10

11

5

9

19

17

15

Calculate a t-statistic to compare the happiness levels before and after getting a pet. The variance for the difference scores is sD2 = 24. Show your work.

Assume that the psychologist uses an =.05, two-tailed, df = (6-1) = 5. The tcritical value = +2.57 and the p-value associated with their t-test statistic was p = .055. Should the psychologist reject or fail to reject the null hypothesis, and why?

Calculate the estimated Cohen’s d to measure the effect size for this study.

Interpret your results as if you were reporting them for a journal article. Use APA style.

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orchestra answered 2 years ago
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