- A group of 30 participants is divided in half based on their self-rating of the vividness of their visual imagery. Each participant is tested on how many colors of objects he or she can correctly recall from a briefly seen display. The results of this experiment are below. (Note: You will need one column in SPSS for the IV with two levels [vivid/less vivid] and one for the DV.)
Vivid
|
Less Vivid
|
18
|
14
|
17
|
12
|
16
|
13
|
15
|
10
|
14
|
8
|
13
|
8
|
9
|
7
|
8
|
6
|
7
|
5
|
6
|
4
|
5
|
3
|
11
|
2
|
13
|
5
|
18
|
11
|
18
|
14
|
Enter the data into SPSS and perform an independent samples t-test of the null hypothesis that vividness of visual imagery does not affect the recall of colors; use alpha = .01 (or 99% confidence), two-tailed. (Hint: The default alpha level is not .01; see options in the test menu.) What is your statistical conclusion?
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SPSS output
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Results write-up
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What are some of the limitations that prevent you from concluding that the visual imagery causes improved color recall in this type of experiment?