Question 1

Which of the following best describes a histogram?

Accepted Answer

A) it is a bar chart used to show the relative frequency of qualitative data 
B) it is commonly used to graphically present quantitative data 
C) it is a bar chart that has no natural separation between the adjacent classes 
D) b and c 
E) all of the above 
A) it is a bar chart used to show the relative frequency of qualitative data 
B) it is commonly used to graphically present quantitative data 
C) it is a bar chart that has no natural separation between the adjacent classes 
D) b and c 
E) all of the above

Question 2

When working with grouped data, classes should touch but not overlap and classes should be of equal widths.

Accepted Answer

A) True 
 B)False

Question 3

The number of days required per audit for 100 recent audits conducted by the IRS office in Cincinnati is shown in the relative frequency table below.Compute the variance of x, the number of required auditors.Treat the data as a population.

Accepted Answer

A) 1.91 
B) 1.25 
C) 1.34 
D) .97 
E) 2.52 
A) 1.91 
B) 1.25 
C) 1.34 
D) .97 
E) 2.52

Question 4

In a relative frequency distribution, is substituted for the absolute count f(x) in each class.

Accepted Answer

A) a relative count P(x) 
B) a cumulative count 
C) a single count 
D) the midpoint 
E) the sample size 
A) a relative count P(x) 
B) a cumulative count 
C) a single count 
D) the midpoint 
E) the sample size

Question 5

The table shows the GDP per capita (in US $s) of the G8 countries (Datablog, Guardian.co.uk, July 8 2009).What is the median GDP per capita of the eight countries?

Accepted Answer

A) $282,018 
B) $35,252 
C) $42,509 
D) $40,288 
E) $37,823 
A) $282,018 
B) $35,252 
C) $42,509 
D) $40,288 
E) $37,823

Question 6

Which of the following distribution shapes is one in which the distribution is split into two identical halves?

Accepted Answer

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

Question 7

When computing descriptive statistics from grouped data

Accepted Answer

A) data values are treated as if they occur at the midpoint of a class 
B) the grouped data result is more accurate than the ungrouped result 
C) the grouped data computations are used only when a population is being analyzed 
D) all of the above 
E) none of the above 
A) data values are treated as if they occur at the midpoint of a class 
B) the grouped data result is more accurate than the ungrouped result 
C) the grouped data computations are used only when a population is being analyzed 
D) all of the above 
E) none of the above

Question 8

If the variance of a data set is correctly computed with the formula using n - 1 in the denominator, which of the following is true:

Accepted Answer

A) the data set is a sample 
B) the data set is a population 
C) the data set could be either a sample or a population 
D) the data set is from a census 
E) none of the above 
A) the data set is a sample 
B) the data set is a population 
C) the data set could be either a sample or a population 
D) the data set is from a census 
E) none of the above

Question 9

Which of the following descriptive measures of dispersion is NOT in the same units as the original data?

Accepted Answer

A) range 
B) mean absolute deviation 
C) variance 
D) standard deviation 
E) none of the above 
A) range 
B) mean absolute deviation 
C) variance 
D) standard deviation 
E) none of the above

Question 10

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

Accepted Answer

A) 1.19 
B) 1.71 
C) 1.84 
D) .67 
E) 1.67 
A) 1.19 
B) 1.71 
C) 1.84 
D) .67 
E) 1.67

Question 11

The mean of a sample:

Accepted Answer

A) cannot exceed the variance of the data set 
B) cannot exceed the standard deviation of the data set 
C) is determined by adding up all of the values and dividing by the number of observations 
D) is determined by adding up all of the values and dividing by the number of observations minus 1. 
E) will be equal to the median 
A) cannot exceed the variance of the data set 
B) cannot exceed the standard deviation of the data set 
C) is determined by adding up all of the values and dividing by the number of observations 
D) is determined by adding up all of the values and dividing by the number of observations minus 1. 
E) will be equal to the median

Question 12

Below is a list of shipping costs quoted by six online retailers for the same item.Compute the MAD for the shipping cost data. $3.00 $2.84 $2.40 $3.02 $2.80 $2.51

Accepted Answer

A) .235 
B) .312 
C) .204 
D) .164 
E) .238 
A) .235 
B) .312 
C) .204 
D) .164 
E) .238

Question 13

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

Accepted Answer

A) 30 
B) 10 
C) 23 
D) 15 
E) 7.5 
A) 30 
B) 10 
C) 23 
D) 15 
E) 7.5

Question 14

Online customers are asked to score the level of customer service they received at Gregory.com.Scores for 20 recent applicants are given below.Show the data in a frequency table, construct the corresponding bar chart.Describe the shape of the distribution. 9 6 8 9 9 5 6 8 5 6
8 9 7 6 8 9 6 5 6 9

Accepted Answer

A) normal 
B) unimodal 
C) bell-shaped 
D) symmetric 
E) bimodal 
A) normal 
B) unimodal 
C) bell-shaped 
D) symmetric 
E) bimodal

Question 15

Purchasing agent Angela Rodriguez reported the number of sales calls she received from suppliers on each of the past 14 days.What is the median number of calls?

Accepted Answer

A) 8 
B) 7.5 
C) 5 
D) 6.5 
E) 6 
A) 8 
B) 7.5 
C) 5 
D) 6.5 
E) 6

Question 16

The closing share price for G.E.stock over the past seven days is shown below.Compute the range for this data. 112, 115, 111, 116, 116, 116, 112

Accepted Answer

A) 4 
B) 6 
C) 5 
D) 4.5 
E) 3 
A) 4 
B) 6 
C) 5 
D) 4.5 
E) 3

Question 17

Atlantic Power and Light tracked daily power surges over the past 500 days.Results are reported in the relative frequency table below.Compute the variance for the number of daily power surges.

Accepted Answer

A) 1.55 
B) 1.05 
C) 1.12 
D) .86 
E) 1.98 
A) 1.55 
B) 1.05 
C) 1.12 
D) .86 
E) 1.98

Question 18

In general, when a data set shows positive skewness, the mean will be smaller than the median; for negatively skewed data, the mean will be larger than the median.

Accepted Answer

A) True 
 B)False

Question 19

The table shows the life expectancy in years of the G8 countries (Datablog, Guardian.co.uk, July 8 2009).What is the mean life expectancy of the eight countries?

Accepted Answer

A) 78.0 
B) 80.5 
C) 81.0 
D) 75.0 
E) 860.0 
A) 78.0 
B) 80.5 
C) 81.0 
D) 75.0 
E) 860.0

Question 20

The descriptive measures (mean, variance, and standard deviation) will yield different values for a relative frequency distribution versus a frequency distribution, for the same data set.

Accepted Answer

A) True 
 B)False

Which of the following best describes a histogram?

When working with grouped data, classes should touch but not overlap and classes should be of equal widths.

The number of days required per audit for 100 recent audits conducted by the IRS office in Cincinnati is shown in the relative frequency table below.Compute the variance of x, the number of required auditors.Treat the data as a population.

In a relative frequency distribution, is substituted for the absolute count f(x) in each class.

The table shows the GDP per capita (in US $s) of the G8 countries (Datablog, Guardian.co.uk, July 8 2009).What is the median GDP per capita of the eight countries?

Which of the following distribution shapes is one in which the distribution is split into two identical halves?

When computing descriptive statistics from grouped data

If the variance of a data set is correctly computed with the formula using n - 1 in the denominator, which of the following is true:

Which of the following descriptive measures of dispersion is NOT in the same units as the original data?

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

The mean of a sample:

Below is a list of shipping costs quoted by six online retailers for the same item.Compute the MAD for the shipping cost data. $3.00 $2.84 $2.40 $3.02 $2.80 $2.51

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

Online customers are asked to score the level of customer service they received at Gregory.com.Scores for 20 recent applicants are given below.Show the data in a frequency table, construct the corresponding bar chart.Describe the shape of the distribution. 9 6 8 9 9 5 6 8 5 6 8 9 7 6 8 9 6 5 6 9

Purchasing agent Angela Rodriguez reported the number of sales calls she received from suppliers on each of the past 14 days.What is the median number of calls?

The closing share price for G.E.stock over the past seven days is shown below.Compute the range for this data. 112, 115, 111, 116, 116, 116, 112

Atlantic Power and Light tracked daily power surges over the past 500 days.Results are reported in the relative frequency table below.Compute the variance for the number of daily power surges.

In general, when a data set shows positive skewness, the mean will be smaller than the median; for negatively skewed data, the mean will be larger than the median.

The table shows the life expectancy in years of the G8 countries (Datablog, Guardian.co.uk, July 8 2009).What is the mean life expectancy of the eight countries?

The descriptive measures (mean, variance, and standard deviation) will yield different values for a relative frequency distribution versus a frequency distribution, for the same data set.

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

Which of the following best describes a histogram?

When working with grouped data, classes should touch but not overlap and classes should be of equal widths.

The number of days required per audit for 100 recent audits conducted by the IRS office in Cincinnati is shown in the relative frequency table below.Compute the variance of x, the number of required auditors.Treat the data as a population.

In a relative frequency distribution, is substituted for the absolute count f(x) in each class.

The table shows the GDP per capita (in US $s) of the G8 countries (Datablog, Guardian.co.uk, July 8 2009).What is the median GDP per capita of the eight countries?

Which of the following distribution shapes is one in which the distribution is split into two identical halves?

When computing descriptive statistics from grouped data

If the variance of a data set is correctly computed with the formula using n - 1 in the denominator, which of the following is true:

Which of the following descriptive measures of dispersion is NOT in the same units as the original data?

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

The mean of a sample:

Below is a list of shipping costs quoted by six online retailers for the same item.Compute the MAD for the shipping cost data. $3.00 $2.84 $2.40 $3.02 $2.80 $2.51

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

Online customers are asked to score the level of customer service they received at Gregory.com.Scores for 20 recent applicants are given below.Show the data in a frequency table, construct the corresponding bar chart.Describe the shape of the distribution. 9 6 8 9 9 5 6 8 5 6 8 9 7 6 8 9 6 5 6 9

Purchasing agent Angela Rodriguez reported the number of sales calls she received from suppliers on each of the past 14 days.What is the median number of calls?

The closing share price for G.E.stock over the past seven days is shown below.Compute the range for this data. 112, 115, 111, 116, 116, 116, 112

Atlantic Power and Light tracked daily power surges over the past 500 days.Results are reported in the relative frequency table below.Compute the variance for the number of daily power surges.

In general, when a data set shows positive skewness, the mean will be smaller than the median; for negatively skewed data, the mean will be larger than the median.

The table shows the life expectancy in years of the G8 countries (Datablog, Guardian.co.uk, July 8 2009).What is the mean life expectancy of the eight countries?

The descriptive measures (mean, variance, and standard deviation) will yield different values for a relative frequency distribution versus a frequency distribution, for the same data set.

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