Standard Deviation

Question 1

The data set on the right represents a sample of the population✔ the population.

Revolt · Accepted Answer

B: the population

Question 2

What is the variance? 29.432.9✔ 8641080

Revolt · Accepted Answer

C: 864

Question 3

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?

Revolt · Accepted Answer

B:

Question 4

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.

Revolt · Accepted Answer

The standard deviation will decrease when the outlier is removed. Standard deviation represents the spread of data from the mean. Both highvalue and lowvalue outliers increase the spread of a data set. Therefore, removing either a highvalue or a lowvalue outlier decreases the spread from the mean, which results in a lower standard deviation.

Question 5

Question 5

Revolt · Accepted Answer

C

Question 6

The z-score is the number of ⇒ standard deviations a data value is away from the .

Revolt · Accepted Answer

Part 2: mean

Question 7

Given that z = –2 and z = –1, which of the following do you know?

Revolt · Accepted Answer

B: The standard deviation is 30.; C: The mean is 80.; 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.

Question 8

Question 8

Revolt · Accepted Answer

B

Question 9

Which formula should be used to calculate the variance? ⇒ C

Revolt · Accepted Answer

A

Question 10

What is the standard deviation? ✔ 29.432.9127.4432

Revolt · Accepted Answer

A: 29.4

Standard Deviation Answers

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