In this SPSS assignment, use the tools learned in Gravetter and Wallnau (2013) Chapter 11 to describe a dependent-samples repeated measures t-test using the teachersurvey.sav SPSS data file. Imagine a researcher is interested in whether teachers' self-esteem differs at the beginning and at the end of the school year. Use the data file: teacher survey.save to conduct a dependent-samples repeated-measures t-test (referred to as a paired-samples t-test in SPSS). In this data- set self-esteem was measured at the beginning of the school year (Score One) and at the end of the school year (Score Two) (i.e. repeated- measures with the same group). These are the variables to be used in this analysis.
- Are the two main assumptions underlying repeated-measures t-tests met? Support your response with SPSS output as needed.
- What are the null and alternative hypotheses?
- What are the mean and standard deviation for beginning self-esteem (Score One) and end self-esteem (Score Two) using APA style?
- What is the value of Cohen's d? Is it small, medium, or large?
- Interpret the mean, standard deviation, standard error, and confidence interval in the paired-samples t-test output box.
- What is the percentage of variance explained? Interpret this value.
- Report the results in APA format.
- What might be concluded from these results? In these conclusions, discuss possible limitations of the study and recommendations for future research.