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