Representing Data

Question 1

The data set on the right represents .

Revolt · Accepted Answer

B: the population

Question 2

What is the variance?

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: mc001-2.jpg

Question 4

Which of the following represents the numerator in the calculation of variance and standard deviation?

Revolt · Accepted Answer

C: (250)2 + (–400)2 + (–250)2 + (350)2 + (100)2 + (–50)2 = 420,000

Question 5

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

Revolt · Accepted Answer

mean

Question 6

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 7

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?

Revolt · Accepted Answer

B: It is less than zx for set B.

Question 8

Which formula should be used to calculate the variance?

Revolt · Accepted Answer

sigma^2 = sum(x - mu)^2 / n

Question 9

What is the standard deviation?

Revolt · Accepted Answer

A: 29.4

Question 10

Why does the formula use “n – 1” in the denominator?

Revolt · Accepted Answer

A: The data is a sample and is expected to be more dispersed from the mean.

Representing Data Answers

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