A sleep research team is interested in the effects of sleep deprivation on subjects' ability to perform a vigilance task, such as locating objects moving on a radar screen. They house their subjects in a sleep laboratory so that they can monitor their sleeping habits.
There are 4 conditions, namely, 4, 12, 20 and 28 hours without sleep. 4 subjects are randomly assigned to each of the conditions.
They are scored on the number of failures to spot objects on a radar screen during a 30-minute test period. Scores are presented below:
|
4hours
|
12hours
|
20hours
|
28hours
|
|
37
|
36
|
43
|
76
|
|
22
|
45
|
75
|
66
|
|
22
|
47
|
66
|
43
|
|
25
|
23 |
46
|
62
|
1. Enter the above data into an SPSS data file using informative variable and value labels as appropriate. Append or cut and paste a screen shot of your data file.
2. Using syntax with the glm command in SPSS, obtain descriptive statistics, perform the overall ANOVA and append the SPSS output. Report the significance of the overall test, assuming that EER is set at α=.05
3. Draw a conclusion concerning the overall test.
The following refers to the above data but is a separate question.
Assume that the research team had decided to test whether the amount of sleep deprivation was systematically related to missing objects on the radar screen by performing a trend analysis, controlling EER at α=.05. Use syntax with the glm command in SPSS to perform this analysis, append the output and answer the following questions.
4. Was a trend analysis appropriate in this design? Why or why not?
5. Interpret and draw conclusions about the results of the analysis you have performed, making explicit the decision rule you are using.
6. Contrast code the deprivation condition variable so that you can replicate the trend analysis above, perform the analysis via the regression command in SPSS and append the output.
Details on submitting your assignment:
- Please ensure that you include the syntax used (which will appear at the top of your output) when you append your output for the different components of the question.
- Please read the relevant sections of the unit outline on how to submit assignments (online via Turnitin in iLearn).
- There is no specified word or page limit, but answers won't need to be too long, just answer the questions.
- Any questions about the assignment should be posted to the discussion forum on iLearn, rather than directed at your tutor. This ensures all students have equal access to the answers to questions.