Standard Deviation

Question 1

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

Revolt · Accepted Answer

the population

Question 2

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

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A

Question 3

What is the variance? ⇒ 58.5

Revolt · Accepted Answer

32

Question 4

Question 4

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(5 - 4.9) / 2

Question 5

Question 5

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(6.5 - 4.9) / 2

Question 6

What is the variance? 29.432.9✔ 8641080

Revolt · Accepted Answer

864; Selection 1: 864; Selection 2: 29.4

Question 7

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

Answer image: https://r10.core.learn.edgenuity.com//media.edgenuity.com/EVresources/3111-12-03-20-03-task/mc001-2.jpg

Question 8

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 9

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

Revolt · Accepted Answer

Part 2: mean

Question 10

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

Revolt · Accepted Answer

The standard deviation is 30.; The mean is 80.; The data point x = 20 is 2 standard deviations from the mean.; The data point x = 50 is 1 standard deviation from the mean.

Standard Deviation Answers

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