Question 1

A histogram is said to be symmetric if, when we draw a vertical line down the center of the histogram, the two sides are identical in shape and size.

Accepted Answer

A) True 
 B)False  True

Question 2

If you wish to compare two data sets of different sizes, it is usually a good idea to convert frequency distributions to relative frequency distributions.

Accepted Answer

A) True 
 B)False  True

Question 3

A local cable system using a sample of 1000 subscribers estimates that fifty percent of its subscribers watch premium channel at least five times per week. This is an example of inferential statistics as opposed to descriptive statistics.

Accepted Answer

A) True 
 B)False  True

Question 4

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

Accepted Answer

A) True 
 B)False

Question 5

Bar charts can typically be formed with the bars vertical or horizontal without affecting the interpretation.

Accepted Answer

A) True 
 B)False

Question 6

Which of the following statements is correct?

Accepted Answer

A)  Univariate data result when a single variable is measured on a single experimental unit. 
B)  Bivariate data result when two variables are measured on a single experimental unit. 
C)  Multivariate data result when more than two variables are measured. 
D)  All of these statements are true. 
E)  None of these statements is true. 
A)  Univariate data result when a single variable is measured on a single experimental unit. 
B)  Bivariate data result when two variables are measured on a single experimental unit. 
C)  Multivariate data result when more than two variables are measured. 
D)  All of these statements are true. 
E)  None of these statements is true.

Question 7

Which of the following statements is true?

Accepted Answer

A)  In constructing a pie chart for a categorical variable, one sector of the pie is assigned to each category of the variable. 
B)  A bar chart for a categorical variable shows the same distribution of measurements in categories as the pie chart, but with the height of each bar measuring how often a particular category was observed. 
C)  The categories for a qualitative variable should be chosen so that a measurement will belong to one and only one category, and each measurement has a category to which it can be assigned. 
D)  In constructing a pie chart for a categorical variable, one sector of the pie is assigned to each category of the variable and a bar chart for a categorical variable shows the same distribution of measurements in categories as the pie chart, but with the height of each bar measuring how often a particular category was observed. 
E)  All of these. 
A)  In constructing a pie chart for a categorical variable, one sector of the pie is assigned to each category of the variable. 
B)  A bar chart for a categorical variable shows the same distribution of measurements in categories as the pie chart, but with the height of each bar measuring how often a particular category was observed. 
C)  The categories for a qualitative variable should be chosen so that a measurement will belong to one and only one category, and each measurement has a category to which it can be assigned. 
D)  In constructing a pie chart for a categorical variable, one sector of the pie is assigned to each category of the variable and a bar chart for a categorical variable shows the same distribution of measurements in categories as the pie chart, but with the height of each bar measuring how often a particular category was observed. 
E)  All of these.

Question 8

The relative frequency of a class is computed by:

Accepted Answer

A)  dividing the frequency of the class by the number of classes 
B)  dividing the frequency of the class by the class width 
C)  dividing the frequency of the class by the total number of observations in the data set 
D)  subtracting the lower limit of the class from the upper limit and multiplying the difference by the number of classes 
E)  adding the lower limit of the class to the upper limit and multiplying the sum by the number of classes 
A)  dividing the frequency of the class by the number of classes 
B)  dividing the frequency of the class by the class width 
C)  dividing the frequency of the class by the total number of observations in the data set 
D)  subtracting the lower limit of the class from the upper limit and multiplying the difference by the number of classes 
E)  adding the lower limit of the class to the upper limit and multiplying the sum by the number of classes

Question 9

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

Accepted Answer

A) True 
 B)False

Question 10

The owner of an Italian restaurant would like to see a graphical display of the number of customers that the restaurant serves. The following data are the average number of customers served each day for the last 12 months.
   Construct a line graph.
Explain what the graph tells us.
________________________________________________________

Accepted Answer

@#IMG-DLM& The restaurant serves the mos

Question 11

One of the differences between a histogram and bar chart is:

Accepted Answer

A)  that the bar chart does have gaps between the bars and the histogram does not 
B)  that the histogram is used to display the distribution of quantitative data and the bar chart is used to display qualitative data 
C)  that the width of the bars is the same in both the histogram and the bar chart 
D)  all of these 
E)  none of these 
A)  that the bar chart does have gaps between the bars and the histogram does not 
B)  that the histogram is used to display the distribution of quantitative data and the bar chart is used to display qualitative data 
C)  that the width of the bars is the same in both the histogram and the bar chart 
D)  all of these 
E)  none of these

Question 12

The largest value in a set of data is 100, and the lowest value is 20. If the resulting frequency distribution is to have five classes of equal width, the class width will be 16.

Accepted Answer

A) True 
 B)False

Question 13

The sum of the frequencies for all classes will always equal:

Accepted Answer

A)  the number of classes 
B)  the class width 
C)  the total number of observations in the data set 
D)  one 
E)  the average 
A)  the number of classes 
B)  the class width 
C)  the total number of observations in the data set 
D)  one 
E)  the average

Question 14

For the same data, a relative frequency histogram will look exactly the same as a frequency histogram.

Accepted Answer

A) True 
 B)False

Question 15

A variable that is normally described in words rather than numerically is a qualitative variable.

Accepted Answer

A) True 
 B)False

Question 16

A branch of the statistics discipline that is used to develop and utilize techniques for effectively presenting numerical information is called inferential statistics.

Accepted Answer

A) True 
 B)False

Question 17

A skewed histogram is one with a long tail extending either to the right or left.

Accepted Answer

A) True 
 B)False

Question 18

Which of the following statements is not true?

Accepted Answer

A)  One form of descriptive statistics uses graphical techniques. 
B)  One form of descriptive statistics uses numerical techniques. 
C)  A distribution is skewed to the left if it contains a few unusually large measurements. 
D)  Statistical inference is used to draw conclusions or inferences about characteristics of populations based on sample data. 
E)  A distribution is skewed to the left if it is symmetric. 
A)  One form of descriptive statistics uses graphical techniques. 
B)  One form of descriptive statistics uses numerical techniques. 
C)  A distribution is skewed to the left if it contains a few unusually large measurements. 
D)  Statistical inference is used to draw conclusions or inferences about characteristics of populations based on sample data. 
E)  A distribution is skewed to the left if it is symmetric.

Question 19

The difference between a histogram and a bar chart is that the histogram represents quantitative data while the bar chart represents qualitative data.

Accepted Answer

A) True 
 B)False

Question 20

Describe the difference between a population and a sample, and provide two examples for each.

Accepted Answer

A population is the collection

A histogram is said to be symmetric if, when we draw a vertical line down the center of the histogram, the two sides are identical in shape and size.

If you wish to compare two data sets of different sizes, it is usually a good idea to convert frequency distributions to relative frequency distributions.

A local cable system using a sample of 1000 subscribers estimates that fifty percent of its subscribers watch premium channel at least five times per week. This is an example of inferential statistics as opposed to descriptive statistics.

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

Bar charts can typically be formed with the bars vertical or horizontal without affecting the interpretation.

Which of the following statements is correct?

Which of the following statements is true?

The relative frequency of a class is computed by:

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

One of the differences between a histogram and bar chart is:

The largest value in a set of data is 100, and the lowest value is 20. If the resulting frequency distribution is to have five classes of equal width, the class width will be 16.

The sum of the frequencies for all classes will always equal:

For the same data, a relative frequency histogram will look exactly the same as a frequency histogram.

A variable that is normally described in words rather than numerically is a qualitative variable.

A branch of the statistics discipline that is used to develop and utilize techniques for effectively presenting numerical information is called inferential statistics.

A skewed histogram is one with a long tail extending either to the right or left.

Which of the following statements is not true?

The difference between a histogram and a bar chart is that the histogram represents quantitative data while the bar chart represents qualitative data.

Describe the difference between a population and a sample, and provide two examples 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

A histogram is said to be symmetric if, when we draw a vertical line down the center of the histogram, the two sides are identical in shape and size.

If you wish to compare two data sets of different sizes, it is usually a good idea to convert frequency distributions to relative frequency distributions.

A local cable system using a sample of 1000 subscribers estimates that fifty percent of its subscribers watch premium channel at least five times per week. This is an example of inferential statistics as opposed to descriptive statistics.

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

Bar charts can typically be formed with the bars vertical or horizontal without affecting the interpretation.

Which of the following statements is correct?

Which of the following statements is true?

The relative frequency of a class is computed by:

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

One of the differences between a histogram and bar chart is:

The largest value in a set of data is 100, and the lowest value is 20. If the resulting frequency distribution is to have five classes of equal width, the class width will be 16.

The sum of the frequencies for all classes will always equal:

For the same data, a relative frequency histogram will look exactly the same as a frequency histogram.

A variable that is normally described in words rather than numerically is a qualitative variable.

A branch of the statistics discipline that is used to develop and utilize techniques for effectively presenting numerical information is called inferential statistics.

A skewed histogram is one with a long tail extending either to the right or left.

Which of the following statements is not true?

The difference between a histogram and a bar chart is that the histogram represents quantitative data while the bar chart represents qualitative data.

Describe the difference between a population and a sample, and provide two examples 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