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Calculate deviation scores for each of the sample test grades listed below. What is the sum of the deviation scores? Note: Remember that you must
Calculate deviation scores for each of the sample test grades listed below. What is the sum of the deviation scores?Note: Remember that you must first calculate the mean.
Grade
100
78
89
92
55
90
80
65
88
95
_________________________________________________________________________________________
Using the grades listed in question above, calculate the range, variance, and standard deviation of the grade distribution. Briefly explain why it is important to square deviation scores in calculating the variance and standard deviation.
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