Compute deviation scores for each of the hypothetical grades listed below. Note: Remember that you must first calculate the mean.
Grade
100
78
89
92
55
90
80
65
88
95
What will be an ideal response?
First it is necessary to calculate the mean. The equation that should be used is X-bar = ?x/N.
This gives X-bar = 832 รท 10 for a class average of 83.20.
Then each individual raw score should have the mean subtracted out.
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