Statistical T-Tests
Using the attached data (i.e., “job satisfaction” and “survey”), perform one analysis (Part A) using a dependent (or paired) samples t-test and the other (Part 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 assignment.)
Part A
Teachers at ACE Charter School were given a 20% raise in their salary in August of 2015. Of all the teachers at ACE, 30 of them were asked to participate in a study to assess the effect of the pay raise on their overall job satisfaction. 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.) (Sample = 30 ACE teachers in the study. Population = all ACE teachers.)
* What is the research question? (Use “difference” or “effect” language as we are no longer talking about “relationship” among variables but differences between groups or an effect of X on a particular population.)
* What is the null hypothesis?
* What is the research hypothesis? (Directional)
* Basic descriiptive 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. (Use the appropriate example below as your template.)
* Please include appropriate tables from the SPSS output used in your analyses.
Part B
Using a sample of 575 participants from River Forest, IL, compare the average years of education (variable name = “educ”) between men and women in this city. (Note: Avoid causal inferences here, and just talk about the differences between men and women in the analysis.) (Population = all adults in River Forest, IL.)
* 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 descriiptive analysis appropriate for the variables used (e.g., mean, median, range, SD, etc.) in a paragraph form along with the SPSS output showing the descriiptive results. Be sure to analyze the years of education by men and women separately. An aggregate analysis of years of education would not be of much use here.
* 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. (Use the appropriate example below as your template.)
* 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 100 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 (using Cohen’s d) is medium 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 (using Cohen’s d) is medium at .56.”
I have attached the SPSS output and relevant material for each part, as well as recommended resources to elaborate on the assignment expectations. Make sure to provide substantial evidence from scholarly resources and refrain from making generalized statements. Textbooks, blogs, magazine or internet articles, book chapters, or special reports, do not count toward scholarly resources.
The powerpoint slides provided come from the class textbook, which should be the primary source used to support your statements (Salkind, N.J. & Frey, B.B. (2020). Statistics for People Who (Think They) Hate Statistics (7th ed.). SAGE Publications, Inc.)
Recommended Sites:
