Discuss the three types of t-tests by creating, analyzing, and reporting the results of a mock experiment.
Preparation
To prepare for this discussion, follow along with our Screen Cast videos 9.6 and 9.9 to make sure you can generate all of the output in those videos.
Require SPSS Videos
Stats 3e Screencast 9.6 (one-sample t-test and a brief explanation of the results)
Optional videos for interpreting SPSS t-test output tables
Interpreting SPSS output for the One Sample t-test (click here)
Interpreting SPSS output for the Independent samples t-test (click here)
Annotated SPSS t-test ouput tables, courtesy of UCLA
To complete this assignment, you are asked to generate a scenario that would require the use of a one sample or independent samples t-test, write your research question and matching hypothesis, generate fake/mock data, enter that correctly into SPSS, calculate one of the types of t-test which is appropriate to analyze that scenario, and explain your results. It would be best to write your replies in MS word, save them, and paste them into this discussion so you don’t lose any work.
Questions
(2 point) Brief introduction to the scenario (explain what you are comparing, what the variables are and what your null and alternative hypotheses are.
(3 pts) Brief explanation of the methods
explain the sample size, sampling method, and measurement methods you might use to have collected the mock data for your study. Use about 20-30 data points.
explain the descriptive statistics and charts which you might use to first analyze the data and check the sample for outliers and normality
list your choice of alpha level and explain that choice. Will you use the standard p<.05 level or a different criterion and why?
list which of the two types of t-test (one-sample or dependent samples) would be used to test your null hypothesis and explain why that is the correct choice. This should include explaining the “assumptions” for using t-tests.
(2 pts) Interpretation
Write a brief description of your results and what it means about your research question. Was there a difference between the means you looked at and what would that tell you about the primary research question? Interpret the effect size measures.
