08 Aug Statistics For Psychology
Use SPSS to analyze the data of Chapter 15, Problem 20, part b, p. 392 of the textbook. For convenience, the problem is repeated here.
A sleep researcher conducts an experiment to determine whether sleep loss affects the ability to maintain sustained attention. Fifteen individuals are randomly divided into the following three groups of five subjects each: group 1, which gets the normal amount of sleep (7-8 hours); group 2, which is sleep-deprived for 24 hours; and group 3, which is sleep-deprived for 48 hours. All three groups are tested on the same auditory vigilance task. Subjects are presented with half-second tones spaced at irregular intervals over a 1-hour duration. Occasionally, one of the tones is slightly shorter than the rest. The subject’s task is to detect the shorter tones. The following percentages of correct detections were observed:
Normal
Sleep
Sleep-Deprived
for 24 Hours
Sleep-Deprived
for 48 Hours
85
83
76
64
75
60
58
76
52
63
60
48
38
47
50
What do you conclude, using α = 0.05.
If you choose to type the data into the Data Editor, name the variables, “Group” and “Pct_Corr.” The saved data file for this problem is “Ch15prob1.”
SOLUTION
Step 1: Enter and Name the Data. As usual, you have three choices for entering the data: 1) by typing the scores directly into the Data Editor; 2) by downloading from the web the saved data file for this example, and 3) by opening the saved data file (for this example) that resides on your computer.
Entering the scores by typing them directly into the Data Editor. If you choose to type in the data, remember to name the grouping variable Group and the other variable Pct_Corr. If you have any questions, please follow the instructions in Illustrative Example 1 for Chapter 15, substituting the variables and scores for this problem.
Entering the scores by downloading from the web, the saved data file for this example. To enter the scores using this option, click here, and then click Open from the drop-down menu.
Entering the scores by opening the saved data file (for this example) that resides on your computer. If you choose to open the saved data file, the name of the file is Ch15prob1. To enter the data and name the variables for this problem, please follow the instructions in Illustrative Example 1 for Chapter 15.
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