Review the SPSS output file that reports the results of the related samples t-test to compare the number of U.S. states where each brand was sold in 2008 with the number of U.S. states where those same brands were sold in 2012. For each brand, there is one value for the number of states in 2008 and another value for the number of states in 2012, making this a repeated measure. Answer the following questions based on your observations of the SPSS output file:
- What was the mean number of U.S. states in which all of the beer brands were sold in 2008?
- What was the mean number of U.S. states in which all of the beer brands were sold in 2012?
- Was there a significant difference in the number of states in which these beer brands were sold in 2008 versus 2012? Report the results of the t-test as follows: t(df value) = ___, and p-value.
- See all attachments.
Use the following information to ensure successful completion of the assignment:
- Researchers wanted to explore self-esteem in adolescent boys and adolescent girls. Each respondent completed a 10-item self-esteem scale (they chose one rating for each item from a Likert-type scale, 1 = strongly disagree and 5 = strongly agree). The sum of the 10 ratings was each respondent’s self-esteem score. Their results were: t = 2.01, d = .90 (40 girls, 40 boys).
- This assignment uses a rubric. Please review the rubric prior to beginning the assignment to become familiar with the expectations for successful completion.
- Use APA style for the writing assignments. The APA Style Guide is located in the Student Success Center.
- This assignment requires that at least four additional scholarly research sources related to this topic, and at least one in-text citation from each source be included.
Directions:
In an essay (500 words), use the scenario presented above to thoroughly answer the following questions:
- What statistical test did the researchers use to determine if there was a statistically significant difference in levels of self-esteem between the boys and the girls?
- What was the purpose of calculating a Cohen’s d? When is a Cohen’s d calculated? Interpret d=.90. What does it mean in this example?
- What if the researcher compared the adolescent boys before treatment and again after treating them for depression? What type of t-test would be most appropriate in this case, and why?
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