Question 1

An online dating service has a quick poll on its website showing the following results.Critique the graph portion of the table.How can it be improved?

Accepted Answer

The graph has no scale on it;

Question 2

The number of houses sold in Miami Springs and the average monthly mortgage rates for 18 months randomly selected between January 2011 and April 2013 are shown in the following table.
   
a.
Draw a scatter diagram with the number of houses sold on the vertical axis.
b.
Describe the relationship between mortgage rate and number of houses sold.

Accepted Answer

a.b.
There is a strong negativ

Question 3

Test scores
The scores on a calculus test for a random sample of 40 students are as follows:
  
-{Test Grades Narrative} Construct a cumulative frequency and a cumulative relative frequency distribution for this data.What proportion of the exam scores are less than 60? What proportion of the exam scores are 70 or more?

Accepted Answer

@#IMG-DLM& 0.35; 1 -

Question 4

In a histogram, each observation is assigned to one or more classes.

Accepted Answer

A) True 
 B)False

Question 5

Which of the following statements illustrates graphical deception?

Accepted Answer

A)  Absolute changes, rather than percentage changes are reported. 
B)  To reduce clutter, the scales of the axes are not shown. 
C)  The Y-axis is stretched or shrunk to show the data in their best possible light. 
D)  All of these choices are true. 
A)  Absolute changes, rather than percentage changes are reported. 
B)  To reduce clutter, the scales of the axes are not shown. 
C)  The Y-axis is stretched or shrunk to show the data in their best possible light. 
D)  All of these choices are true.

Question 6

Teachers Ages
The ages (in years) of a sample of 25 teachers are as follows:
  
-{Teachers Ages Narrative} Construct an ogive for this data.Estimate the proportion of salespersons that are: 1) under 30 years of age; 2) 40 years of age or over; and 3) between 40 and 50 years of age.

Accepted Answer

According to the ogive below,

Question 7

When a distribution has more values to the right and tails to the left, we say it is skewed negatively.

Accepted Answer

A) True 
 B)False

Question 8

In applications involving two variables, X and Y, where one variable depends to some degree on the other, we call Y the ____________________ variable.

Accepted Answer

The answer of In applications involving two variables, X and...

Question 9

A supermarket's monthly sales (in thousands of dollars) for the last year were as follows:
   Construct a relative frequency bar chart for this data set.How many observations are there in this data set?

Accepted Answer

See the graph below.There are

Question 10

If we draw a straight line through the points in a scatter diagram and most of the points fall close to the line, there must be a positive relationship between the two variables.

Accepted Answer

A) True 
 B)False

Question 11

The scatter diagram below depicts data with a negative linear relationship.

Accepted Answer

A) True 
 B)False

Question 12

Test scores
The scores on a calculus test for a random sample of 40 students are as follows:
  
-{Test Grades Narrative) Construct an ogive for this data set.Use the ogive to estimate the proportion of exam scores that are between 80 and 90.

Accepted Answer

@#IMG-DLM& The proportion of g

Question 13

Which of the following statements about histograms is true?

Accepted Answer

A)  A histogram is a summary of interval data. 
B)  A histogram is made of a series of intervals, called classes. 
C)  The classes in a histogram cover the complete range of observations. 
D)  All of these choices are true. 
A)  A histogram is a summary of interval data. 
B)  A histogram is made of a series of intervals, called classes. 
C)  The classes in a histogram cover the complete range of observations. 
D)  All of these choices are true.

Question 14

Teachers Ages
The ages (in years) of a sample of 25 teachers are as follows:
  
-{Teachers Ages Narrative} Draw a frequency histogram of this data which contains six classes.What is the shape of the histogram?

Accepted Answer

@#IMG-DLM& This histogram of a

Question 15

An economics professor wants to study the relationship between income and education.A sample of 10 individuals is selected at random, and their income (in thousands of dollars) and education (in years) are shown below:
   
a.
Draw a scatter diagram for these data with the income on the vertical axis.
b.
Describe the relationship between income and education.

Accepted Answer

a.b.
There is a very strong po

Question 16

The weights of a sample of 25 workers are given (in pounds): 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.Construct an ogive for the data.What proportion of the worker's weights are between 160 and 180 pounds; below 150 pounds; and at or above 140 pounds, respectively?

Accepted Answer

@#IMG-DLM& The proportions are

Question 17

A line chart is created by plotting the value of the variable on the ____________________ axis and the time periods on the ____________________ axis.

Accepted Answer

vertical;

Question 18

When two variables tend to move in opposite directions, yet still form a linear pattern, how do you describe their relationship?

Accepted Answer

A)  A positive linear relationship. 
B)  A negative linear relationship. 
C)  A proportional inverse relationship. 
D)  None of these choices. 
A)  A positive linear relationship. 
B)  A negative linear relationship. 
C)  A proportional inverse relationship. 
D)  None of these choices.

Question 19

Home Care
Data are collected on the number of house calls (x) made in a given week by each of 60 nurses in a certain hospital.The same data set is displayed in each of the three histograms below.      
-{Home Care Narrative} How many nurses are there in this hospital?

Accepted Answer

60; you get this number by adding up all

Question 20

In order to draw a scatter diagram, we need interval data for

Accepted Answer

A)  one variable 
B)  two variables 
C)  three variables 
D)  four variables 
A)  one variable 
B)  two variables 
C)  three variables 
D)  four variables

An online dating service has a quick poll on its website showing the following results.Critique the graph portion of the table.How can it be improved?

In a histogram, each observation is assigned to one or more classes.

Which of the following statements illustrates graphical deception?

Teachers Ages The ages (in years) of a sample of 25 teachers are as follows: -{Teachers Ages Narrative} Construct an ogive for this data.Estimate the proportion of salespersons that are: 1) under 30 years of age; 2) 40 years of age or over; and 3) between 40 and 50 years of age.

When a distribution has more values to the right and tails to the left, we say it is skewed negatively.

In applications involving two variables, X and Y, where one variable depends to some degree on the other, we call Y the ____________________ variable.

A supermarket's monthly sales (in thousands of dollars) for the last year were as follows: Construct a relative frequency bar chart for this data set.How many observations are there in this data set?

If we draw a straight line through the points in a scatter diagram and most of the points fall close to the line, there must be a positive relationship between the two variables.

The scatter diagram below depicts data with a negative linear relationship.

Test scores The scores on a calculus test for a random sample of 40 students are as follows: -{Test Grades Narrative) Construct an ogive for this data set.Use the ogive to estimate the proportion of exam scores that are between 80 and 90.

Which of the following statements about histograms is true?

Teachers Ages The ages (in years) of a sample of 25 teachers are as follows: -{Teachers Ages Narrative} Draw a frequency histogram of this data which contains six classes.What is the shape of the histogram?

A line chart is created by plotting the value of the variable on the axis and the time periods on the axis.

When two variables tend to move in opposite directions, yet still form a linear pattern, how do you describe their relationship?

Home Care Data are collected on the number of house calls (x) made in a given week by each of 60 nurses in a certain hospital.The same data set is displayed in each of the three histograms below. -{Home Care Narrative} How many nurses are there in this hospital?

In order to draw a scatter diagram, we need interval data for

What Is Statistics

Graphical Descriptive Techniques I

Numerical Descriptive Techniques

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

Simple Linear Regression and Correlation

Multiple Regression

Filters

Exam 3: Graphical Descriptive Techniques II

An online dating service has a quick poll on its website showing the following results.Critique the graph portion of the table.How can it be improved?

In a histogram, each observation is assigned to one or more classes.

Which of the following statements illustrates graphical deception?

Teachers Ages The ages (in years) of a sample of 25 teachers are as follows: -{Teachers Ages Narrative} Construct an ogive for this data.Estimate the proportion of salespersons that are: 1) under 30 years of age; 2) 40 years of age or over; and 3) between 40 and 50 years of age.

When a distribution has more values to the right and tails to the left, we say it is skewed negatively.

In applications involving two variables, X and Y, where one variable depends to some degree on the other, we call Y the ____________________ variable.

A supermarket's monthly sales (in thousands of dollars) for the last year were as follows: Construct a relative frequency bar chart for this data set.How many observations are there in this data set?

If we draw a straight line through the points in a scatter diagram and most of the points fall close to the line, there must be a positive relationship between the two variables.

The scatter diagram below depicts data with a negative linear relationship.

Test scores The scores on a calculus test for a random sample of 40 students are as follows: -{Test Grades Narrative) Construct an ogive for this data set.Use the ogive to estimate the proportion of exam scores that are between 80 and 90.

Which of the following statements about histograms is true?

Teachers Ages The ages (in years) of a sample of 25 teachers are as follows: -{Teachers Ages Narrative} Draw a frequency histogram of this data which contains six classes.What is the shape of the histogram?

A line chart is created by plotting the value of the variable on the ____________________ axis and the time periods on the ____________________ axis.

When two variables tend to move in opposite directions, yet still form a linear pattern, how do you describe their relationship?

Home Care Data are collected on the number of house calls (x) made in a given week by each of 60 nurses in a certain hospital.The same data set is displayed in each of the three histograms below. -{Home Care Narrative} How many nurses are there in this hospital?

In order to draw a scatter diagram, we need interval data for

What Is Statistics

Graphical Descriptive Techniques I

Numerical Descriptive Techniques

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

Simple Linear Regression and Correlation

Multiple Regression

Filters

A line chart is created by plotting the value of the variable on the axis and the time periods on the axis.