Home / Questions / Although Dr. Marshalls and Dr Bensons PSY 210 classes had the same mean Quiz 1 grade µ 80...
Although Dr. Marshall's and Dr. Benson's PSY 210 classes had the same mean Quiz 1 grade (µ = 80%), Dr. Marshall's class had a standard deviation of σ = 5 and Dr. Benson's class had a standard deviation of σ = 10.
Which class had more consistent grades?
In which class would a grade of 85% be most impressive?
A) Dr. Benson; Dr. Marshall
B) Dr. Benson; Dr. Benson
C) Dr. Marshall; Dr. Marshall
D) Dr. Marshall; Dr. Benson
2) Find the standard deviation for the following population data.
6, 4, 4, 3, 3, 2, 2, 2, 1
A) σ = 1.5
B) σ = 1.031
C) σ = 1.414
D) σ = 2
E) σ = 0.943
F) σ = 8.485
3) Find the standard deviation for the following sample data.
X f
8 2
7 1
6 4
A) s = 0.776
B) s = 1.458
C) s = 0.905
D) s = 6.194
E) s = 0.951
F) s = 0.880
G) s = 6.690
4) A sample has a standard deviation of 5. What is the variance for this sample?
A) 5
B) 25
C) 10
D) There is not enough information to determine the sample variance.
E) 2.236
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