Question 1

Summaries of data, which may be tabular, graphical, or numerical, are referred to as:

Accepted Answer

A) inferential statistics 
B) descriptive statistics 
C) statistical inference 
D) report generation 
E) none of the above 
A) inferential statistics 
B) descriptive statistics 
C) statistical inference 
D) report generation 
E) none of the above

Question 2

On a recent biology quiz, about 90 percent of students earned excellent scores, but the other 10 percent did very poorly.The shape of the distribution of quiz scores is best described as:

Accepted Answer

A) symmetric 
B) positively skewed 
C) negatively skewed 
D) steeply peaked 
E) bimodal 
A) symmetric 
B) positively skewed 
C) negatively skewed 
D) steeply peaked 
E) bimodal

Question 3

A data display that shows the number of data set members that are at or below a particular value or the number of data set members that are at or above a particular value is called a ___________ distribution.

Accepted Answer

A) unimodal 
B) symmetric 
C) positively skewed 
D) cumulative 
E) negatively skewed 
A) unimodal 
B) symmetric 
C) positively skewed 
D) cumulative 
E) negatively skewed

Question 4

The total number of data items with a value less than or equal to the upper limit for the class is given by the:

Accepted Answer

A) frequency distribution 
B) relative frequency distribution 
C) cumulative frequency distribution 
D) cumulative relative frequency distribution 
E) none of the above 
A) frequency distribution 
B) relative frequency distribution 
C) cumulative frequency distribution 
D) cumulative relative frequency distribution 
E) none of the above

Question 5

In a cumulative frequency distribution, we can show directly the number of data set members at or below any specified value.

Accepted Answer

A) True 
 B)False

Question 6

In a bar chart, is indicated by an elongated tail in the left-hand direction.

Accepted Answer

A) positive skewness 
B) negative skewness 
C) symmetry 
D) kurtosis 
E) bi-modal 
A) positive skewness 
B) negative skewness 
C) symmetry 
D) kurtosis 
E) bi-modal

Question 7

Purchasing agent Angela Rodriguez reported the number of sales calls she received from suppliers on each of the past 14 days.Compute the variance for her daily calls during the 14-day period.Treat the data as a sample.

Accepted Answer

A) 1.88 
B) 1.14 
C) 1.67 
D) .78 
E) 1.41 
A) 1.88 
B) 1.14 
C) 1.67 
D) .78 
E) 1.41

Question 8

The following chart gives the number of full years served by the first 42 presidents of the United States (up to and including George W.Bush).What is the average number of full years served by the first 42 presidents of the United States?

Accepted Answer

A) 4.0 years 
B) 4.2 years 
C) 4.8 years 
D) 5.2 years 
E) 6.5 years 
A) 4.0 years 
B) 4.2 years 
C) 4.8 years 
D) 5.2 years 
E) 6.5 years

Question 9

Test scores for 40 job applicants at Briar and Flanagan are reported in the table below.Suppose you intend to show the values in a grouped data relative frequency table, using the intervals 30 to under 40, 40 to under 50, 50 to under 60, and so on.What's the relative frequency value that you should enter in the table for the interval "70 to under 80"?

Accepted Answer

A) .125 
B) .175 
C) .150 
D) .200 
E) .250 
A) .125 
B) .175 
C) .150 
D) .200 
E) .250

Question 10

Over the past month, Kim recorded the number of hours she slept each night.The frequency table below summarizes her sleep habits.What is the average number of hours Kim slept each night?

Accepted Answer

A) 5 hours 
B) 7.4 hours 
C) 7.5 hours 
D) 7.7 hours 
E) 6.6 hours 
A) 5 hours 
B) 7.4 hours 
C) 7.5 hours 
D) 7.7 hours 
E) 6.6 hours

Question 11

For a sample of 10 days, Harkin Research recorded the number of visitors to Tilton.com's website.Determine the variance for the data.Treat the data as a sample. 100, 100, 106, 93, 89, 95, 97, 181, 99, 100

Accepted Answer

A) 26.75 
B) 715.8 
C) 654.9 
D) 515.2 
E) 32.7 
A) 26.75 
B) 715.8 
C) 654.9 
D) 515.2 
E) 32.7

Question 12

When should measures of location and dispersion be computed from grouped data rather than from individual data values?

Accepted Answer

A) as much as possible since computations are easier 
B) only when individual data values are unavailable 
C) whenever computer packages for descriptive statistics are unavailable 
D) only when the data are from a population 
E) none of the above 
A) as much as possible since computations are easier 
B) only when individual data values are unavailable 
C) whenever computer packages for descriptive statistics are unavailable 
D) only when the data are from a population 
E) none of the above

Question 13

When calculating the mean for grouped data, which of the following is used for the weights in the formula:

Accepted Answer

A) midpoint of each class 
B) the class frequencies 
C) the upper limit of each class 
D) the bin range 
E) none of the above 
A) midpoint of each class 
B) the class frequencies 
C) the upper limit of each class 
D) the bin range 
E) none of the above

Question 14

Below is a table showing the ages of current active users of FaceTime.com.Use the table to approximate the standard deviation of user ages.

Accepted Answer

A) 22.9 
B) 19.7 
C) 12.8 
D) 34.6 
E) 25.2 
A) 22.9 
B) 19.7 
C) 12.8 
D) 34.6 
E) 25.2

Question 15

The term ______ describes the shape of a distribution of values when the distribution has two peaks.

Accepted Answer

A) skewed 
B) symmetric 
C) negatively adjusted 
D) bimodal 
E) positively skewed 
A) skewed 
B) symmetric 
C) negatively adjusted 
D) bimodal 
E) positively skewed

Question 16

For a sample of 10 days, Harkin Research recorded the number of visitors to Tilton.com's website.Determine the median value for the data. 100, 100, 106, 93, 89, 95, 97, 181, 99, 100

Accepted Answer

A) 100 
B) 121 
C) 99.5 
D) 106 
E) 115 
A) 100 
B) 121 
C) 99.5 
D) 106 
E) 115

Question 17

The relative frequency of a class is computed by:

Accepted Answer

A) dividing the midpoint of the class by the sample size 
B) dividing the frequency of the class by the midpoint 
C) dividing the sample size by the frequency of the class 
D) dividing the frequency of the class by the sample size 
E) none of the above 
A) dividing the midpoint of the class by the sample size 
B) dividing the frequency of the class by the midpoint 
C) dividing the sample size by the frequency of the class 
D) dividing the frequency of the class by the sample size 
E) none of the above

Question 18

The closing share price for G.E.stock over the past seven days is shown below.Compute the variance for the data.Treat the data as a population. 112, 115, 111, 116, 116, 116, 112

Accepted Answer

A) 3.671 
B) 4.589 
C) 3.423 
D) 4.286 
E) 5.112 
A) 3.671 
B) 4.589 
C) 3.423 
D) 4.286 
E) 5.112

Question 19

The is the measure of central tendency that is most affected by very large or very small data values.

Accepted Answer

A) mean 
B) median 
C) mode 
D) range 
E) variance 
A) mean 
B) median 
C) mode 
D) range 
E) variance

Question 20

The number of US solar energy companies that applied for special tax credits in each of the past 11 months, according to a recent study, is shown below.Determine the mean for the data. 14, 17, 12, 11, 17, 20, 11, 12, 15, 17, 20

Accepted Answer

A) 16.33 
B) 15.89 
C) 16.67 
D) 15.09 
E) 13.44 
A) 16.33 
B) 15.89 
C) 16.67 
D) 15.09 
E) 13.44

Summaries of data, which may be tabular, graphical, or numerical, are referred to as:

On a recent biology quiz, about 90 percent of students earned excellent scores, but the other 10 percent did very poorly.The shape of the distribution of quiz scores is best described as:

A data display that shows the number of data set members that are at or below a particular value or the number of data set members that are at or above a particular value is called a ___________ distribution.

The total number of data items with a value less than or equal to the upper limit for the class is given by the:

In a cumulative frequency distribution, we can show directly the number of data set members at or below any specified value.

In a bar chart, is indicated by an elongated tail in the left-hand direction.

Purchasing agent Angela Rodriguez reported the number of sales calls she received from suppliers on each of the past 14 days.Compute the variance for her daily calls during the 14-day period.Treat the data as a sample.

The following chart gives the number of full years served by the first 42 presidents of the United States (up to and including George W.Bush).What is the average number of full years served by the first 42 presidents of the United States?

Over the past month, Kim recorded the number of hours she slept each night.The frequency table below summarizes her sleep habits.What is the average number of hours Kim slept each night?

For a sample of 10 days, Harkin Research recorded the number of visitors to Tilton.com's website.Determine the variance for the data.Treat the data as a sample. 100, 100, 106, 93, 89, 95, 97, 181, 99, 100

When should measures of location and dispersion be computed from grouped data rather than from individual data values?

When calculating the mean for grouped data, which of the following is used for the weights in the formula:

Below is a table showing the ages of current active users of FaceTime.com.Use the table to approximate the standard deviation of user ages.

The term ______ describes the shape of a distribution of values when the distribution has two peaks.

For a sample of 10 days, Harkin Research recorded the number of visitors to Tilton.com's website.Determine the median value for the data. 100, 100, 106, 93, 89, 95, 97, 181, 99, 100

The relative frequency of a class is computed by:

The closing share price for G.E.stock over the past seven days is shown below.Compute the variance for the data.Treat the data as a population. 112, 115, 111, 116, 116, 116, 112

The is the measure of central tendency that is most affected by very large or very small data values.

The number of US solar energy companies that applied for special tax credits in each of the past 11 months, according to a recent study, is shown below.Determine the mean for the data. 14, 17, 12, 11, 17, 20, 11, 12, 15, 17, 20

An Introduction to Statistics

Descriptive Statistics II: Additional Descriptive Measures and Data Displays

Probability

Discrete Probability Distributions

Continuous Probability Distributions

Statistical Inference: Estimating a Population Mean

Interval Estimates for Proportions, Mean Differences and Proportion Differences

Statistical Hypothesis Testing: Hypothesis Tests for a Population Mean

Hypothesis Tests for Proportions, Mean Differences and Proportion Differences

Basic Regression Analysis

Multiple Regression

F Tests and Analysis of Variance

Experimental Designonline Only

Chi-Square Tests

Filters

Exam 2: Descriptive Statistics I: Elementary Data Presentation and Description

Summaries of data, which may be tabular, graphical, or numerical, are referred to as:

On a recent biology quiz, about 90 percent of students earned excellent scores, but the other 10 percent did very poorly.The shape of the distribution of quiz scores is best described as:

A data display that shows the number of data set members that are at or below a particular value or the number of data set members that are at or above a particular value is called a ___________ distribution.

The total number of data items with a value less than or equal to the upper limit for the class is given by the:

In a cumulative frequency distribution, we can show directly the number of data set members at or below any specified value.

In a bar chart, is indicated by an elongated tail in the left-hand direction.

Purchasing agent Angela Rodriguez reported the number of sales calls she received from suppliers on each of the past 14 days.Compute the variance for her daily calls during the 14-day period.Treat the data as a sample.

The following chart gives the number of full years served by the first 42 presidents of the United States (up to and including George W.Bush).What is the average number of full years served by the first 42 presidents of the United States?

Over the past month, Kim recorded the number of hours she slept each night.The frequency table below summarizes her sleep habits.What is the average number of hours Kim slept each night?

For a sample of 10 days, Harkin Research recorded the number of visitors to Tilton.com's website.Determine the variance for the data.Treat the data as a sample. 100, 100, 106, 93, 89, 95, 97, 181, 99, 100

When should measures of location and dispersion be computed from grouped data rather than from individual data values?

When calculating the mean for grouped data, which of the following is used for the weights in the formula:

Below is a table showing the ages of current active users of FaceTime.com.Use the table to approximate the standard deviation of user ages.

The term ______ describes the shape of a distribution of values when the distribution has two peaks.

For a sample of 10 days, Harkin Research recorded the number of visitors to Tilton.com's website.Determine the median value for the data. 100, 100, 106, 93, 89, 95, 97, 181, 99, 100

The relative frequency of a class is computed by:

The closing share price for G.E.stock over the past seven days is shown below.Compute the variance for the data.Treat the data as a population. 112, 115, 111, 116, 116, 116, 112

The is the measure of central tendency that is most affected by very large or very small data values.

The number of US solar energy companies that applied for special tax credits in each of the past 11 months, according to a recent study, is shown below.Determine the mean for the data. 14, 17, 12, 11, 17, 20, 11, 12, 15, 17, 20

An Introduction to Statistics

Descriptive Statistics II: Additional Descriptive Measures and Data Displays

Probability

Discrete Probability Distributions

Continuous Probability Distributions

Statistical Inference: Estimating a Population Mean

Interval Estimates for Proportions, Mean Differences and Proportion Differences

Statistical Hypothesis Testing: Hypothesis Tests for a Population Mean

Hypothesis Tests for Proportions, Mean Differences and Proportion Differences

Basic Regression Analysis

Multiple Regression

F Tests and Analysis of Variance

Experimental Designonline Only

Chi-Square Tests

Filters