A researcher wants to investigate different formats for taking an exam. She randomly assigns onethird of the class to an open book exam, one-third to no notes, and one-third to one page of notes only. The data appear below.
You can use SPSS to analyze the data or do things “by hand” for this problem to answer the following questions. Be sure to include your SPSS output and or work.
- What is the F statistic reported in appropriate APA style?
- What is your decision? (use alpha = .05)
- Do you need to conduct a follow-up test?
- Do you need to determine the effect size? If yes, what are the results?
Open book No notes One page only
65 88 70
70 94 72
72 89 76
- 98 80
82 93 81
- 94 82
Two-way ANOVAs
An industrial psychologist was interested in the impact of Introductory Message (general greeting, inquiry, or statement) and Type of Phone (land line or cell) on the length of a phone call. The data appear below.
Use SPSS to analyze the data and answer the following questions. Be sure to include your SPSS output.
Phone Message
| Phone Type | General | Inquiry | Statement |
| Land Line | 8 9 8 4 7 5 | 8 10 9 6 7 8 | 3 4 5 6 2 1 |
| Cell | 9 8 6 7 10 9 | 10 8 7 6 5 8 | 2 1 4 3 3 2 |
- What are the F statistics (in appropriate APA style) for:
- The main effect for Phone Message
- The main effect for Phone Type
- The interaction of Phone Message and Phone Type
- Regarding each of the above F statistics, what are your decisions for (alpha = .05):
- The main effect for Phone Message
- The main effect for Phone Type
- The interaction of Phone Message and Phone Type
- Do you need to test simple effects?
- Do you need to conduct any follow-up analyses of main effects?
- Do you need to determine the effect size? If yes, what are the results?
Portfolio exercise: Essay questions
Answer each of the following questions. You may use your text and notes to answer the question, but DO NOT simply copy/paste the information. Put your answers into your own words. Copy/paste will result in a zero for the answer.
Each question is worth 10 points.
- Go to the library (physical or online) and select 3 empirical articles from psychological journals that match your interests. For each article, provide the following information:
- What is the null hypothesis? (may not be explicitly stated)
- What is the research hypothesis? (may not be explicitly stated)
- Select one of the studies and write an alternate research hypothesis.
- What is statistical significance and why is it important with respect to our analysis of data?
