Standard Deviation Assignment
Which of the following represents the numerator in the calculation of variance and standard deviation?
D
z1 = z5 = z6.5 =
-1.95 0.05 0.8
What is the standard deviation?
29.4
What is the standard deviation, rounded to the nearest whole number?
290
What is the variance?
58.5
What is the variance?
84000
A contractor records all of the bedroom areas, in square feet, of a five-bedroom house as: 100, 100, 120, 120, 180 What is the variance?
864
Why does the formula use "n - 1" in the denominator?
A
A contractor records the areas, in square feet, of several houses in a neighborhood to determine data about the neighborhood. Which formula should be used to calculate the standard deviation?
B
Given that zmr001-1.jpg = -2 and zmr001-2.jpg = -1, which of the following do you know?
B C E F
Which formula should be used to calculate the variance?
C
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?
It is less than zx for set B. B
a data value is away from the
Mean
The data set on the right represents
The population
A set of data has a high-value outlier. How do you expect the standard deviation to change when the outlier is removed? Would the result be different if the data had a low-value outlier instead? Explain.
The standard deviation will decrease when the outlier is removed. Standard deviation represents the spread of data from the mean. Removing a highvalue outlier decreases the spread of data from the mean. Removing a lowvalue outlier decreases the spread of data from the mean. In both cases the standard deviation decreases
The z-score is the number of
standard deviations