Group Means and Standard Deviations of Procrastination Log scores Intake Outtake Group M SD M SD Same-attribution group (n = 27) 43.5 8.6 37.4 9.1 No attribution group (n = 27) 45.7 5.9 33.4 10.8 Different-attribution group (n = 27) 41.9 10.7 36.8 9.2

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The Procrastination Log (PL)…was administered both at intake [pretest to a one-hour individual counseling session on procrastination] and on outtake [posttest]. The PL is the most widely used instrument for assessing difficulties with procrastination. It is a 9- item self-report questionnaire that measures procrastination-related behavior during the past week. 

  1. Assuming that the distribution of PL scores for the “No attribution group” at “Intake” is normal, between what two scores did approximately the middle 95% of participants lie? 

2. Assuming that the distribution of PL scores for the “No attribution group” at “Outtake” is normal, between what two scores did approximately the middle 99.7% of participants lie?
           

Group Means and Standard Deviations of Procrastination Log scores
Intake
Outtake
Group
SD
SD
Same-attribution
group (n = 27)
43.5
8.6
37.4
9.1
No attribution group
(n = 27)
45.7
5.9
33.4
10.8
Different-attribution
group (n = 27)
41.9
10.7
36.8
9.2
%3D
*Higher scores indicate greater self-reported procrastination
Transcribed Image Text:Group Means and Standard Deviations of Procrastination Log scores Intake Outtake Group SD SD Same-attribution group (n = 27) 43.5 8.6 37.4 9.1 No attribution group (n = 27) 45.7 5.9 33.4 10.8 Different-attribution group (n = 27) 41.9 10.7 36.8 9.2 %3D *Higher scores indicate greater self-reported procrastination
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