Question 1

The stem-and-leaf plot is used to display the distribution of:

Accepted Answer

A)  qualitative data 
B)  quantitative data 
C)  two quantitative variables on the same chart 
D)  all of these 
A)  qualitative data 
B)  quantitative data 
C)  two quantitative variables on the same chart 
D)  all of these

Question 2

In a line chart, the horizontal axis represents time (such as months, years) and the vertical axis represents the value of the variable of interest.

Accepted Answer

A) True 
 B)False

Question 3

A bar chart in which the bars are ordered from smallest to largest is called a Pareto chart.

Accepted Answer

A) True 
 B)False

Question 4

Which of the following statements is false?

Accepted Answer

A)  When constructing a frequency distribution for categorical data, it will always be necessary to develop class boundaries. 
B)  It is often a good idea to convert frequency distributions to relative frequency distributions when you compare two distributions with different amount of data. 
C)  A pie is the familiar circular graph that shows how the measurements are distributed among the categories of a qualitative variable. 
D)  None of these. 
E)  All of these. 
A)  When constructing a frequency distribution for categorical data, it will always be necessary to develop class boundaries. 
B)  It is often a good idea to convert frequency distributions to relative frequency distributions when you compare two distributions with different amount of data. 
C)  A pie is the familiar circular graph that shows how the measurements are distributed among the categories of a qualitative variable. 
D)  None of these. 
E)  All of these.

Question 5

The most important and commonly graphical presentation of quantitative data is the:

Accepted Answer

A)  bar chart 
B)  histogram 
C)  pie chart 
D)  dotplot 
E)  time series plot 
A)  bar chart 
B)  histogram 
C)  pie chart 
D)  dotplot 
E)  time series plot

Question 6

Which of the following statements is false?

Accepted Answer

A)  A bar chart and histogram can be used interchangeably. 
B)  The bars on a bar chart have the same width. 
C)  The simplest graph for quantitative data is the dotplot. 
D)  There are gaps between the bars in a bar chart. 
E)  All of these. 
A)  A bar chart and histogram can be used interchangeably. 
B)  The bars on a bar chart have the same width. 
C)  The simplest graph for quantitative data is the dotplot. 
D)  There are gaps between the bars in a bar chart. 
E)  All of these.

Question 7

A limnologist is studying a Minnesota lake in October. He records the temperatures in °C for surface water taken every other day at noon. The data are shown below.
8.5 8.1 7.9 9.0 7.7 7.3 7.1 6.8 9.2
6.8 6.3 7.0 6.5 5.7 5.9 4.9 4.2 6.9
a. Construct a stem and leaf plot to display the distribution of the data.
   
b. Would you describe the distribution of the data as symmetric, skewed to the right or skewed to the left?
______________
c. Explain.
________________________________________________________

Accepted Answer

2, 9; 7, 9; 3, 5, 8, 8, 9; 0, 1, 3, 7, 9

Question 8

A politician who is running for the office of governor of a state with 7 million registered voters commissions a survey. In the survey, 55% of the 10,000 registered voters interviewed say they plan to vote for her. The population of interest is the:

Accepted Answer

A)  7 million registered voters in the state 
B)  10,000 registered voters interviewed 
C)  55 %, or 5,500 voters interviewed who plan to vote for her 
D)  45%, or 4,500 voters interviewed who plan not to vote for her 
E)  55% of the 7 million registered voters in the state 
A)  7 million registered voters in the state 
B)  10,000 registered voters interviewed 
C)  55 %, or 5,500 voters interviewed who plan to vote for her 
D)  45%, or 4,500 voters interviewed who plan not to vote for her 
E)  55% of the 7 million registered voters in the state

Question 9

Which of the following is not recommended when constructing a relative frequency histogram?

Accepted Answer

A)  equal width classes 
B)  mutually exclusive classes 
C)  open-ended classes 
D)  none of these 
E)  all of these 
A)  equal width classes 
B)  mutually exclusive classes 
C)  open-ended classes 
D)  none of these 
E)  all of these

Question 10

Persons or objects on which an experiment is performed are called experimental units.

Accepted Answer

A) True 
 B)False

Question 11

In general, incomes of employees in large firms tend to be:

Accepted Answer

A)  skewed to the right 
B)  skewed to the left 
C)  symmetric 
D)  unknown 
A)  skewed to the right 
B)  skewed to the left 
C)  symmetric 
D)  unknown

Question 12

A highway department would like to repair a certain highway during the slowest part of a day to help minimize traffic congestion. Because it would be impossible to monitor the traffic flow on every day, they monitor how many vehicles pass on this highway during one particular day. Based on these results the department decides when to repair the highway. Describe the population and sample in this problem.
Population: ________________________________________________________
Sample: ________________________________________________________

Accepted Answer

All the traffic flow on all da

Question 13

A relative frequency histogram can be constructed by letting the horizontal axis or the vertical axis represent the variable of interest.

Accepted Answer

A) True 
 B)False

Question 14

Which of the following best describes a relative class frequency?

Accepted Answer

A)  It is the number of observations that falls into a given class in a frequency distribution. 
B)  It is the proportion of all observations that falls into a given class in a frequency distribution. 
C)  It is the difference between the numerical lower and upper limit of a class of quantitative data. 
D)  It is the number of observations that falls into the smallest class in a frequency distribution. 
E)  None of these. 
A)  It is the number of observations that falls into a given class in a frequency distribution. 
B)  It is the proportion of all observations that falls into a given class in a frequency distribution. 
C)  It is the difference between the numerical lower and upper limit of a class of quantitative data. 
D)  It is the number of observations that falls into the smallest class in a frequency distribution. 
E)  None of these.

Question 15

A discrete quantitative variable is one that can assume values only at specific points on an interval of values, with inevitable gaps between them.

Accepted Answer

A) True 
 B)False

Question 16

The best type of chart for comparing two sets of qualitative data is:

Accepted Answer

A)  a line chart 
B)  a pie chart 
C)  a histogram 
D)  a bar chart 
E)  all of these 
A)  a line chart 
B)  a pie chart 
C)  a histogram 
D)  a bar chart 
E)  all of these

Question 17

A graphical portrayal of a relative frequency distribution of continuous quantitative data in such a way that lower and upper limits of data classes are identified by tick marks on a horizontal axis, while the corresponding relative class frequencies are represented by the areas of vertical rectangles connected to each other and stand on top of each of these class intervals, is called:

Accepted Answer

A)  a bar chart 
B)  a frequency polygon 
C)  a pictogram 
D)  a time series plot 
E)  none of these 
A)  a bar chart 
B)  a frequency polygon 
C)  a pictogram 
D)  a time series plot 
E)  none of these

Question 18

Stem and leaf plots are often used to analyze qualitative data in most real life applications.

Accepted Answer

A) True 
 B)False

Question 19

Compared to the frequency distribution, the stem-and-leaf plot provides more details, since it can describe the individual data values as well as show how many are in each group, or stem.

Accepted Answer

A) True 
 B)False

Question 20

Describe the difference between descriptive statistics and inferential statistics, and give an example for each.

Accepted Answer

Descriptive statistics consists of proce

The stem-and-leaf plot is used to display the distribution of:

In a line chart, the horizontal axis represents time (such as months, years) and the vertical axis represents the value of the variable of interest.

A bar chart in which the bars are ordered from smallest to largest is called a Pareto chart.

Which of the following statements is false?

The most important and commonly graphical presentation of quantitative data is the:

Which of the following statements is false?

A politician who is running for the office of governor of a state with 7 million registered voters commissions a survey. In the survey, 55% of the 10,000 registered voters interviewed say they plan to vote for her. The population of interest is the:

Which of the following is not recommended when constructing a relative frequency histogram?

Persons or objects on which an experiment is performed are called experimental units.

In general, incomes of employees in large firms tend to be:

A relative frequency histogram can be constructed by letting the horizontal axis or the vertical axis represent the variable of interest.

Which of the following best describes a relative class frequency?

A discrete quantitative variable is one that can assume values only at specific points on an interval of values, with inevitable gaps between them.

The best type of chart for comparing two sets of qualitative data is:

Stem and leaf plots are often used to analyze qualitative data in most real life applications.

Compared to the frequency distribution, the stem-and-leaf plot provides more details, since it can describe the individual data values as well as show how many are in each group, or stem.

Describe the difference between descriptive statistics and inferential statistics, and give an example for each.

Describing Data With Numerical Measures

Describing Bivariate Data

Probability and Probability Distributions

Several Useful Discrete Distributions

The Normal Probability Distribution

Sampling Distributions

Large-Sample Estimation

Large-Sample Tests of Hypotheses

Inference From Small Samples

The Analysis of Variance

Linear Regression and Correlation

Multiple Regression Analysis

Analysis of Categorical Data

Nonparametric Statistics

Filters

Exam 1: Describing Data With Graphs

The stem-and-leaf plot is used to display the distribution of:

In a line chart, the horizontal axis represents time (such as months, years) and the vertical axis represents the value of the variable of interest.

A bar chart in which the bars are ordered from smallest to largest is called a Pareto chart.

Which of the following statements is false?

The most important and commonly graphical presentation of quantitative data is the:

Which of the following statements is false?

A politician who is running for the office of governor of a state with 7 million registered voters commissions a survey. In the survey, 55% of the 10,000 registered voters interviewed say they plan to vote for her. The population of interest is the:

Which of the following is not recommended when constructing a relative frequency histogram?

Persons or objects on which an experiment is performed are called experimental units.

In general, incomes of employees in large firms tend to be:

A relative frequency histogram can be constructed by letting the horizontal axis or the vertical axis represent the variable of interest.

Which of the following best describes a relative class frequency?

A discrete quantitative variable is one that can assume values only at specific points on an interval of values, with inevitable gaps between them.

The best type of chart for comparing two sets of qualitative data is:

Stem and leaf plots are often used to analyze qualitative data in most real life applications.

Compared to the frequency distribution, the stem-and-leaf plot provides more details, since it can describe the individual data values as well as show how many are in each group, or stem.

Describe the difference between descriptive statistics and inferential statistics, and give an example for each.

Describing Data With Numerical Measures

Describing Bivariate Data

Probability and Probability Distributions

Several Useful Discrete Distributions

The Normal Probability Distribution

Sampling Distributions

Large-Sample Estimation

Large-Sample Tests of Hypotheses

Inference From Small Samples

The Analysis of Variance

Linear Regression and Correlation

Multiple Regression Analysis

Analysis of Categorical Data

Nonparametric Statistics

Filters