Question 1

Briefly describe these data.Sketch its box plot and describe the sample succinctly.

Accepted Answer

Skewed right (mean > median),a

Question 2

Which is a characteristic of the mean as a measure of center?

Accepted Answer

A)  Deviations do not sum to zero when there are extreme values. 
B)  It is less reliable than the mode when the data are continuous. 
C)  It utilizes all the information in a sample. 
D)  It is usually equal to the median in business data. 
A)  Deviations do not sum to zero when there are extreme values. 
B)  It is less reliable than the mode when the data are continuous. 
C)  It utilizes all the information in a sample. 
D)  It is usually equal to the median in business data.

Question 3

Which statement is false?

Accepted Answer

A)  The coefficient of variation cannot be used when the mean is zero. 
B)  The standard deviation is in the same units as the mean (e.g. ,kilograms). 
C)  The mean from a frequency tabulation may differ from the mean from raw data. 
D)  The skewness coefficient is zero in a sample from any normal distribution. 
A)  The coefficient of variation cannot be used when the mean is zero. 
B)  The standard deviation is in the same units as the mean (e.g. ,kilograms). 
C)  The mean from a frequency tabulation may differ from the mean from raw data. 
D)  The skewness coefficient is zero in a sample from any normal distribution.

Question 4

A certain health maintenance organization (HMO)examined the number of office visits by its members in the last year.This data set would probably be skewed to the left due to low outliers.

Accepted Answer

A) True 
 B)False

Question 5

VenalCo Market Research surveyed 50 individuals who recently purchased a certain CD,revealing the age distribution shown below.Which statement is least defensible?

Accepted Answer

A)  The mean age probably exceeds the median age. 
B)  The mode would be a reasonable measure of center. 
C)  The data are somewhat skewed to the left. 
D)  The CD is unlikely to appeal to retirees. 
A)  The mean age probably exceeds the median age. 
B)  The mode would be a reasonable measure of center. 
C)  The data are somewhat skewed to the left. 
D)  The CD is unlikely to appeal to retirees.

Question 6

Chebyshev's Theorem says that at least 95 percent of the data lie within 2 standard deviations of the mean.

Accepted Answer

A) True 
 B)False

Question 7

Ten randomly chosen students at a certain university were asked how many times they smoked marijuana during the preceding week.Their answers were 0,8,0,0,2,4,0,0,6,0.A campus newspaper article appeared,with the headline "Average Student Uses No Pot." Is this a fair assessment of central tendency? Discuss the alternatives.

Accepted Answer

Mode and median are

Question 8

Estimating the mean from grouped data will tend to be most accurate when:

Accepted Answer

A)  observations are distributed uniformly within classes. 
B)  there are few classes with wide class limits. 
C)  the sample is not very large and bins are wide. 
D)  the standard deviation is large relative to the mean. 
A)  observations are distributed uniformly within classes. 
B)  there are few classes with wide class limits. 
C)  the sample is not very large and bins are wide. 
D)  the standard deviation is large relative to the mean.

Question 9

Here are descriptive statistics from Excel for annual per-pupil expenditures in 94 Ohio cities and home sizes in a certain neighborhood.Very briefly compare the variability and shape of the two data sets.

Accepted Answer

Expenditure per pupil is right-skewed (m

Question 10

The ______________ shows the relationship between two variables.

Accepted Answer

A)  box plot 
B)  bar chart 
C)  histogram 
D)  scatter plot 
A)  box plot 
B)  bar chart 
C)  histogram 
D)  scatter plot

Question 11

The following frequency distribution shows the amount earned yesterday by employees of a large Las Vegas casino.Estimate the mean daily earnings.

Accepted Answer

A)  $112.50 
B)  $125.01 
C)  $105.47 
D)  $117.13 
A)  $112.50 
B)  $125.01 
C)  $105.47 
D)  $117.13

Question 12

Kurtosis cannot be judged accurately by looking at a histogram.

Accepted Answer

A) True 
 B)False

Question 13

Which of the following statements is likely to apply to the incomes of 50 randomly chosen taxpayers in California?

Accepted Answer

A)  The median income would probably be near the mean. 
B)  The midhinge would be a robust measure of center. 
C)  The sum of squared deviations about the mean would be negative. 
D)  Outliers in either tail would be equally likely. 
A)  The median income would probably be near the mean. 
B)  The midhinge would be a robust measure of center. 
C)  The sum of squared deviations about the mean would be negative. 
D)  Outliers in either tail would be equally likely.

Question 14

A survey of 10 randomly chosen drivers showed the following number of persons per car including the driver: 1,5,1,5,2,1,1,1,2,1.Describe the center,variability,and skewness for this sample.

Accepted Answer

Mean is 2,median is

Question 15

In the following data set {7,5,0,2,7,15,5,2,7,18,7,3,0},the value 7 is:

Accepted Answer

A)  the mean. 
B)  the mode. 
C)  both the mode and median. 
D)  both the mean and mode. 
A)  the mean. 
B)  the mode. 
C)  both the mode and median. 
D)  both the mean and mode.

Question 16

A positive kurtosis coefficient in Excel indicates a leptokurtic condition in a distribution.

Accepted Answer

A) True 
 B)False

Question 17

Below are the ages of 21 CEOs.Find the mean,median,and mode.Are there any outliers? Explain.
46,48,49,49,50,52,54,55,57,57,58,59,60,61,62,62,63,63,65,67,75

Accepted Answer

Mean is 57.714,median is 58,th

Question 18

If Q1 = 150 and Q3 = 250,the upper fences (inner and outer)are:

Accepted Answer

A)  450 and 600. 
B)  350 and 450. 
C)  400 and 550. 
D)  impossible to determine without more information. 
A)  450 and 600. 
B)  350 and 450. 
C)  400 and 550. 
D)  impossible to determine without more information.

Question 19

In Osaka,Japan,stock brokers earn ¥6000 per hour on the average,with a standard deviation of ¥1200.In Stuttgart,Germany,stock brokers earn an average of €18 per hour with a standard deviation of €6.In which country is the variation in wages greatest?

Accepted Answer

Osaka CV = 25 percen

Question 20

Which of the following is not a valid description of an outlier?

Accepted Answer

A)  A data value beyond the outer fences 
B)  A data value that is very unusual 
C)  A data value that lies below Q1 or above Q3 
D)  A data value several standard deviations from the mean. 
A)  A data value beyond the outer fences 
B)  A data value that is very unusual 
C)  A data value that lies below Q1 or above Q3 
D)  A data value several standard deviations from the mean.

Briefly describe these data.Sketch its box plot and describe the sample succinctly.

Which is a characteristic of the mean as a measure of center?

Which statement is false?

A certain health maintenance organization (HMO)examined the number of office visits by its members in the last year.This data set would probably be skewed to the left due to low outliers.

VenalCo Market Research surveyed 50 individuals who recently purchased a certain CD,revealing the age distribution shown below.Which statement is least defensible?

Chebyshev's Theorem says that at least 95 percent of the data lie within 2 standard deviations of the mean.

Estimating the mean from grouped data will tend to be most accurate when:

Here are descriptive statistics from Excel for annual per-pupil expenditures in 94 Ohio cities and home sizes in a certain neighborhood.Very briefly compare the variability and shape of the two data sets.

The ______________ shows the relationship between two variables.

The following frequency distribution shows the amount earned yesterday by employees of a large Las Vegas casino.Estimate the mean daily earnings.

Kurtosis cannot be judged accurately by looking at a histogram.

Which of the following statements is likely to apply to the incomes of 50 randomly chosen taxpayers in California?

A survey of 10 randomly chosen drivers showed the following number of persons per car including the driver: 1,5,1,5,2,1,1,1,2,1.Describe the center,variability,and skewness for this sample.

In the following data set {7,5,0,2,7,15,5,2,7,18,7,3,0},the value 7 is:

A positive kurtosis coefficient in Excel indicates a leptokurtic condition in a distribution.

Below are the ages of 21 CEOs.Find the mean,median,and mode.Are there any outliers? Explain. 46,48,49,49,50,52,54,55,57,57,58,59,60,61,62,62,63,63,65,67,75

If Q₁ = 150 and Q₃ = 250,the upper fences (inner and outer)are:

In Osaka,Japan,stock brokers earn ¥6000 per hour on the average,with a standard deviation of ¥1200.In Stuttgart,Germany,stock brokers earn an average of €18 per hour with a standard deviation of €6.In which country is the variation in wages greatest?

Which of the following is not a valid description of an outlier?

Overview of Statistics

Data Collection

Describing Data Visually

Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions and Estimation

One-Sample Hypothesis Tests

Two-Sample Hypothesis Tests

Analysis of Variance

Simple Regression

Multiple Regression

Time-Series Analysis

Chi-Square Tests

Nonparametric Tests

Quality Management

Filters

Exam 4: Descriptive Statistics

Briefly describe these data.Sketch its box plot and describe the sample succinctly.

Which is a characteristic of the mean as a measure of center?

Which statement is false?

A certain health maintenance organization (HMO)examined the number of office visits by its members in the last year.This data set would probably be skewed to the left due to low outliers.

VenalCo Market Research surveyed 50 individuals who recently purchased a certain CD,revealing the age distribution shown below.Which statement is least defensible?

Chebyshev's Theorem says that at least 95 percent of the data lie within 2 standard deviations of the mean.

Estimating the mean from grouped data will tend to be most accurate when:

Here are descriptive statistics from Excel for annual per-pupil expenditures in 94 Ohio cities and home sizes in a certain neighborhood.Very briefly compare the variability and shape of the two data sets.

The ______________ shows the relationship between two variables.

The following frequency distribution shows the amount earned yesterday by employees of a large Las Vegas casino.Estimate the mean daily earnings.

Kurtosis cannot be judged accurately by looking at a histogram.

Which of the following statements is likely to apply to the incomes of 50 randomly chosen taxpayers in California?

A survey of 10 randomly chosen drivers showed the following number of persons per car including the driver: 1,5,1,5,2,1,1,1,2,1.Describe the center,variability,and skewness for this sample.

In the following data set {7,5,0,2,7,15,5,2,7,18,7,3,0},the value 7 is:

A positive kurtosis coefficient in Excel indicates a leptokurtic condition in a distribution.

Below are the ages of 21 CEOs.Find the mean,median,and mode.Are there any outliers? Explain. 46,48,49,49,50,52,54,55,57,57,58,59,60,61,62,62,63,63,65,67,75

If Q1 = 150 and Q3 = 250,the upper fences (inner and outer)are:

In Osaka,Japan,stock brokers earn ¥6000 per hour on the average,with a standard deviation of ¥1200.In Stuttgart,Germany,stock brokers earn an average of €18 per hour with a standard deviation of €6.In which country is the variation in wages greatest?

Which of the following is not a valid description of an outlier?

Overview of Statistics

Data Collection

Describing Data Visually

Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions and Estimation

One-Sample Hypothesis Tests

Two-Sample Hypothesis Tests

Analysis of Variance

Simple Regression

Multiple Regression

Time-Series Analysis

Chi-Square Tests

Nonparametric Tests

Quality Management

Filters

If Q₁ = 150 and Q₃ = 250,the upper fences (inner and outer)are: