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# assignment 6

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perform one analysis (i.e., Part A or B) using a dependent (or paired) samples t-test and the other (i.e., Part A or B) using the independent samples t-test. Determine appropriate test for each relationship, and then proceed with your analyses.  (To be clear, you are required to perform TWO t-tests in this submission.)

Part A

Thirty teachers at ACE Charter School were given a 20% raise in their salary in August of 2015. How was their job satisfaction (“0” = very unsatisfied to “50” = very satisfied) affected as a result? (Note: You can make causal inferences in this analysis.)

What is the research question? (Use “difference” language as we are no longer talking about “relationship” among variables but differences between groups.)

What is the null hypothesis?

What is the research hypothesis? (Directional)

Basic descriptive analysis appropriate for the variables used (e.g., mean, median, range, SD, etc.) in a paragraph form. (Don’t just include a number of SPSS tables and not talk about it.)

State the rationale for applying either independent or dependent t-test in this investigation using appropriate readings and resources in Module 6. (Please cite specific references.)

Write out the results in an APA format.

Please include appropriate tables from the SPSS output used in your analyses.

Part B

Using a sample of 575 participants, compare the average years of education (variable name = “educ”) between men and women in River Forest, IL . (Note: Avoid causal inferences here, and just talk about the differences between men and women in the analysis.)

What is the research question?  (Use “difference” language as we are no longer talking about “relationship” among variables but differences between groups.)

What is the null hypothesis?

What is the research hypothesis? (Non-Directional)

Basic descriptive analysis appropriate for the variables used (e.g., mean, median, range, SD, etc.) in a paragraph form. (Don’t just include a number of SPSS tables and not talk about it.)

State the rationale for applying either independent or dependent t-test for in this investigation using appropriate readings and resources in Module 6. (Please cite specific references.)

Write out the results in an APA format.

Please include appropriate tables from the SPSS output used in your analyses.

An Example of a Paired-Samples t-Test Result Write Up

“Using a sample of 99 participants, a paired-sample t-test was conducted to compare the number of words recalled (from 0 to 15) in ginkgo and placebo conditions. There was a significant difference in the number of words recalled for ginkgo (M = 6.23, SD = 3.91) and placebo (M = 4.35, SD = 3.45) conditions; t(99) = 4.12, p < .001. These results suggest that consumption of ginkgo is related to a significant or meaningful increase in one’s memory, by about two points. The size of the effect is moderate at .51.”

An Example of an Independent Samples t-Test Result Write Up

“Using a sample of 200 participants, an independent samples t-test was conducted to compare the number of words recalled (from 0 to 15) in ginkgo (n = 100) and placebo (n = 100) groups. There was a significant difference in the number of words recalled for ginkgo (M = 7.95, SD = 3.91) and placebo (M = 5.85, SD = 3.60) groups; t(198) = 1.99, p = .03. These results suggest that ginkgo group had greater word recall than their placebo counterparts, by about two words. The size of the effect is small at .27.”

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