PSYC 421
STATISTICS EFRESHER SSIGNMENT R A
Student Name: Tori Williamson
Suppose you have magically changed places with the professor teaching this course and that you have just
administered an examination that consists of 100 multiple-choice items (where 1 point is awarded for
each correct answer). The distribution of scores for the 25 students enrolled in your class could
theoretically range from 0 (none correct) to 100 (all correct). Below are your student’s scores. You will
use this raw data to complete all of the calculations in this assignment:
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PSYC 421
One task at hand is to communicate the test results to your class. You want to do that in a way that will
help students understand how their performance on the test compared with the performances of other
students. Probably, the first step is to arrange the data by converting it from a casual listing of raw scores
into something that immediately provides a little more information.
Display (in descending order) the test scores and complete the table below. ( ) The first calculation 6 points
is completed for you, in , as an example. To calculate f(X) multiply the score times it’s frequency. red
Example: 96(1) = 96.
Scores from Your Test (X) Score f (frequency) f(X)
96 1 96
94 94
1
92 92
1
87 87
1
85 85
1
84 84
1
83 83
1
82 82
1
79 79
1
78 78
1
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PSYC 421
76 76
1
73 73
1
72 72
1
69 138
2
67 134
2
66 66
1
63 63
1
