Standard Deviation Answers
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What is the variance?
Answer:
84000
2
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Which of the following represents the numerator in the calculation of variance and standard deviation?
A
(225)2 + (–425)2 + (–275)2 + (325)2 + (75)2 + (–75)2 = 423,750B
(650)2 + (–150)2 + (–600)2 + (250)2 + (150)2 + (–300)2 = 980,000C
(250)2 + (–400)2 + (–250)2 + (350)2 + (100)2 + (–50)2 = 420,0003
The z-score is the number of [___] a data value is away from the [___].
Answer:
standard deviations
4
z1 = [___]
Answer:
-1.95
5
Given that z = –2 and z = –1, which of the following do you know?
A
The variance is 10.B
The standard deviation is 30.C
The mean is 80.D
The median is 40.E
The data point x = 20 is 2 standard deviations from the mean.F
The data point x = 50 is 1 standard deviation from the mean.G
The data point x = 45 has a z-value of 1.5.6
The data value x exists in two data sets: A and B. The mean is equal for both data sets. If the standard deviation for set A is greater than the standard deviation for set B, which is true for zx for set A?
A
It is equal to zx for set B.B
It is less than zx for set B.C
It is greater than zx for set B.Did you find these answers helpful?
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