# Research Method

Instructions: Im going to go easy on you for this discussion. We learned a lot about the t-Test for independent samples, and last week you compared the total \$ amount in coins for males and females. This week, in Part One, I want you to review that assignment recalculate effect size individually (Cohens d using the pooled variance). Then, as a group answer a few questions about power. Youll use the same data set you used last week, so make sure you have that. Finally, answer some simple questions about the dependent samples t-Test in Part Two!
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d12_assignment.docx

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Discussion #12  The Power of My Two Cents
Instructions: Im going to go easy on you for this discussion. We learned a lot about the t-Test
for independent samples, and last week you compared the total \$ amount in coins for males and
females. This week, in Part One, I want you to review that assignment recalculate effect size
individually (Cohens d using the pooled variance). Then, as a group answer a few questions
about power. Youll use the same data set you used last week, so make sure you have that.
Finally, answer some simple questions about the dependent samples t-Test in Part Two!
Part One  Independent Samples t-Test  Effect Size
1. Using the t-Test data from our male and female participants (coin study), individually
compute the effect size. (Turn in image files for each group member for Cohens d
calculation)
Group #1: Females mean and SD:
Group #2: Males mean and SD:
Cohens d:
2. Is Cohens d a large, medium, or small effect size for our coin data set?
3. What does effect size really mean? Why do we report it?
Part Two  Dependent Samples t-Test
4. Explain when you would you use a dependent samples t-Test rather than an independent
sample t-Test? What are the benefits and problems with each design? Be specific!
5. Using similar IVs and DVs, design a study that uses a dependent samples t-Test design
and a study that uses an independent samples t-Test (base them on the same general topic
 this can be any topic, not just the two cents topic). Make sure to note your
independent and dependent variables.
6. For #2 above, write up the results (using fake data) as you would see them in a results
section of an APA empirical research article. Make sure to have one write-up for the
independent samples t-Test and one for the dependent samples t-Test.

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