Eagle Sleep Research, Inc. hypothesizes that people who are allowed to sleep for only four hours will score differently than people who are allowed to sleep for eight hours on a cognitive skills test. Sixteen participants are recruited into the sleep lab and randomly assigned to one of two groups. In group one, participants sleep for eight hours and in group 2, participants sleep for four hours. The next morning a cognitive skills test is administered to all participants. Scores on the cognitive skills test range from 1-9 with high scores representing better performance.
Create an MSWord document to answer the short answer questions from part II and III of this exercise. The name of the file will be “5.3 SPSS Exercise – Short Answer Questions”. Save this for subsequent upload as one of your deliverables for this exercise.
Answer the following based on the narrative and data provided:
Part#1
- What kind of t-test will need to be performed (i.e., are these means and groups independent or related in any way)
- Is this a one-tailed or two-tailed test
- Calculate degrees of freedom by hand using the formulas in the text book.
- What is the hypothesis?
- Look up the value for t-critical in Table C.2, Appendix C in the text book at the p<.05 level for the type of test you identified earlier (one or two tailed?).
Part #2 - What are your numerical results (t value, degrees of freedom, etc., written in APA format for results write up – t(xx) = x.xx, p = xx ).
- What is your N for each group?
- What are the means for each group?
- What is the standard deviation for each group?
Sample Solution