Data Set 1: Math Pretest Scores
(Calculating Mean, Variance, and Standard Deviation)
Test Scores Step 1 Step 2
Difference Square
100
98
96
94
88
87
82
80
76
75
75
75
73
72
71
70
68
67
59
54
Sum =
MEAN = Step 3 Sum of Squares =
Step 4: Divide sum of squares by N
Variance =
Step 5: Standard deviation = square root of Step 4.
STANDARD DEVIATION =
Data Set 2: Math Pretest Scores
(Calculating Mean, Variance, and Standard Deviation)
Test Scores Step 1 Step 2
Difference Square
98
98
89
86
78
76
76
75
75
75
75
74
74
73
72
68
65
59
58
56
Sum =
MEAN = Step 3 Sum of Squares:
Step 4 Divide sum of squares by N =
Variance =
Step 5: Standard deviation = square root of Step 4.
STANDARD DEVIATION =
