Question 1

The ____________________ is calculated by finding the middle of the data set, when the data are ordered from smallest to largest.

Accepted Answer

The answer of The ____________________ is calculated by finding the...

Question 2

The shape of a distribution helps answer which question about the data?

Accepted Answer

A) Where is the approximate center of the distribution? 
B) Are the observations close to one another, or are they widely dispersed? 
C) Is the distribution symmetric? 
D) All of these choices are true. 
A) Where is the approximate center of the distribution? 
B) Are the observations close to one another, or are they widely dispersed? 
C) Is the distribution symmetric? 
D) All of these choices are true.

Question 3

The value for Q3 can never be smaller than the value for Q1.

Accepted Answer

A) True 
 B)False

Question 4

Which of the following is correct about the shape of a distribution?

Accepted Answer

A) The shape can show you how many modes there are. 
B) The shape can help you determine the approximate center of the distribution. 
C) The shape can help you determine whether the data are close or spread out. 
D) All of these choices are true. 
A) The shape can show you how many modes there are. 
B) The shape can help you determine the approximate center of the distribution. 
C) The shape can help you determine whether the data are close or spread out. 
D) All of these choices are true.

Question 5

NARRBEGIN: Pets Survey
Pets Survey
A sample of 40 families were asked how many pets they owned. Their responses are summarized in the following table. $$\begin{array} { | l | l l l l l l | } 
\hline \text { Number of Pets } & 0 & 1 & 2 & 3 & 4 & 5 \
\hline \text { Number of Families } & 3 & 20 & 5 & 4 & 2 & 2 \
\hline
\end{array}$$ NARREND
-{Pets Survey Narrative} Determine the mean, the median, and the mode of the number of pets owned per family.

Accepted Answer

@#LAT-DLM& = [(0 * 3) + (1 *20) + (2 *5)

Question 6

NARRBEGIN: Weights of Workers
Weights of Workers
The following data represent the number of employees of a sample of 25 companies: 164, 148, 137, 157, 173, 156, 177, 172, 169, 165, 145, 168, 163, 162, 174, 152, 156, 168, 154, 151, 174, 146, 134, 140, and 171.NARREND
-{Weights of Workers Narrative} Is the distribution of the number of workers symmetric or skewed? Why?

Accepted Answer

The distribution is negatively

Question 7

A perfect straight line sloping downward would produce a correlation coefficient equal to:

Accepted Answer

A) +1.0 
B) -1.0 
C) 0.0 
D) Cannot tell from the information given. 
A) +1.0 
B) -1.0 
C) 0.0 
D) Cannot tell from the information given.

Question 8

The following data represent the number of children in a sample of 10 families from a certain community: 4, 2, 1, 1, 5, 3, 0, 1, 0, and 2.
a.Compute the range.
b.Compute the variance.
c.Compute the standard deviation.
d.Compute the coefficient of variation.
e.Explain why in this case range > variance > standard deviation > coefficient of variation.

Accepted Answer

a.5
b.2.77
c.1.66
d.0.87
e.The range is

Question 9

If the coefficient of correlation r = 0, there can be no relationship whatsoever between the dependent variable y and the independent variable x.

Accepted Answer

A) True 
 B)False

Question 10

Differences in the frequencies of a histogram appear to be more dramatic if you ____________________ the vertical axis.

Accepted Answer

The answer of Differences in the frequencies of a histogram...

Question 11

The following graph shows pepper prices throughout a 12-month period.   Suppose you made a new graph of the same data, where the maximum value on the Y-axis was changed from 5.0 to 10.0. (Assume everything else stays the same.) Your new graph would appear to have ____ variability in pepper prices compared to the original graph shown above.

Accepted Answer

A) more 
B) less 
C) the same 
D) unknown 
A) more 
B) less 
C) the same 
D) unknown

Question 12

NARRBEGIN: Weights of Police Officer
Weights of Police Officers
The following data represent the weights in pounds of a sample of 25 police officers: 164, 148, 137, 157, 173, 156, 177, 172, 169, 165, 145, 168, 163, 162, 174, 152, 156, 168, 154, 151, 174, 146, 134, 140, and 171.NARREND
-{Weights of Police Officers Narrative} Determine the location and value of the lower quartile of the weights.

Accepted Answer

Location = L₂₅ = 6.5,

Question 13

The magnitude of the correlation measures the ____________________ of a linear relationship.

Accepted Answer

The answer of The magnitude of the correlation measures the...

Question 14

Differences in the frequencies of a histogram appear to be less dramatic if you ____________________ the vertical axis.

Accepted Answer

The answer of Differences in the frequencies of a histogram...

Question 15

Possible methods of graphical deception include:

Accepted Answer

A) A graph without a scale on one axis. 
B) A graph's caption that influences the impression of the viewer. 
C) A graph where absolute changes, rather than percentage changes, are reported. 
D) All of these choices are true. 
A) A graph without a scale on one axis. 
B) A graph's caption that influences the impression of the viewer. 
C) A graph where absolute changes, rather than percentage changes, are reported. 
D) All of these choices are true.

Question 16

Which of the following characteristics does a histogram help you identify?

Accepted Answer

A) The shape of distribution. 
B) The approximate center of a distribution. 
C) The amount of spread in a distribution. 
D) All of these choices are true. 
A) The shape of distribution. 
B) The approximate center of a distribution. 
C) The amount of spread in a distribution. 
D) All of these choices are true.

Question 17

The first and second quartiles of a data set can never be equal.

Accepted Answer

A) True 
 B)False

Question 18

A box plot is a graphical representation of the 5-number summary.

Accepted Answer

A) True 
 B)False

Question 19

In a negatively skewed distribution, which of the following is the correct statement?

Accepted Answer

A) The distance from Q1 to Q2 is smaller than the distance from Q2 to Q3 
B) The distance from the smallest observation to Q1 is larger than the distance from Q3 to the largest observation 
C) The distance from the smallest observation to Q2 is smaller than the distance from Q2 to the largest observation 
D) The distance from Q1 to Q3 is twice the distance from the Q1 to Q2 
A) The distance from Q1 to Q2 is smaller than the distance from Q2 to Q3 
B) The distance from the smallest observation to Q1 is larger than the distance from Q3 to the largest observation 
C) The distance from the smallest observation to Q2 is smaller than the distance from Q2 to the largest observation 
D) The distance from Q1 to Q3 is twice the distance from the Q1 to Q2

Question 20

The line drawn within the box of a box plot always represents the median.

Accepted Answer

A) True 
 B)False

The ____________________ is calculated by finding the middle of the data set, when the data are ordered from smallest to largest.

The shape of a distribution helps answer which question about the data?

The value for Q₃ can never be smaller than the value for Q₁.

Which of the following is correct about the shape of a distribution?

A perfect straight line sloping downward would produce a correlation coefficient equal to:

If the coefficient of correlation r = 0, there can be no relationship whatsoever between the dependent variable y and the independent variable x.

Differences in the frequencies of a histogram appear to be more dramatic if you ____________________ the vertical axis.

The magnitude of the correlation measures the ____________________ of a linear relationship.

Differences in the frequencies of a histogram appear to be less dramatic if you ____________________ the vertical axis.

Possible methods of graphical deception include:

Which of the following characteristics does a histogram help you identify?

The first and second quartiles of a data set can never be equal.

A box plot is a graphical representation of the 5-number summary.

In a negatively skewed distribution, which of the following is the correct statement?

The line drawn within the box of a box plot always represents the median.

What Is Statistics

Graphical Descriptive Techniques I

Graphical Descriptive Techniques II

Data Collection and Sampling

Probability

Random Variables and Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions

Introduction to Estimation

Introduction to Hypothesis Testing

Inference About a Population

Inference About Comparing Two Populations

Analysis of Variance

Chi-Squared Tests Optional

Simple Linear Regression and Correlation

Multiple Regression

Filters

Exam 4: Numerical Descriptive Techniques

The ____________________ is calculated by finding the middle of the data set, when the data are ordered from smallest to largest.

The shape of a distribution helps answer which question about the data?

The value for Q3 can never be smaller than the value for Q1.

Which of the following is correct about the shape of a distribution?

A perfect straight line sloping downward would produce a correlation coefficient equal to:

If the coefficient of correlation r = 0, there can be no relationship whatsoever between the dependent variable y and the independent variable x.

Differences in the frequencies of a histogram appear to be more dramatic if you ____________________ the vertical axis.

The magnitude of the correlation measures the ____________________ of a linear relationship.

Differences in the frequencies of a histogram appear to be less dramatic if you ____________________ the vertical axis.

Possible methods of graphical deception include:

Which of the following characteristics does a histogram help you identify?

The first and second quartiles of a data set can never be equal.

A box plot is a graphical representation of the 5-number summary.

In a negatively skewed distribution, which of the following is the correct statement?

The line drawn within the box of a box plot always represents the median.

What Is Statistics

Graphical Descriptive Techniques I

Graphical Descriptive Techniques II

Data Collection and Sampling

Probability

Random Variables and Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions

Introduction to Estimation

Introduction to Hypothesis Testing

Inference About a Population

Inference About Comparing Two Populations

Analysis of Variance

Chi-Squared Tests Optional

Simple Linear Regression and Correlation

Multiple Regression

Filters

The value for Q₃ can never be smaller than the value for Q₁.