Question 1

If the standard deviation of x is 18, the covariance of x and y is 120, the coefficient r = 0.90, then the standard deviation of y is 54.87.

Accepted Answer

A) True 
 B)False

Question 2

The coefficient of variation allows us to compare two sets of data based on different measurement units.

Accepted Answer

A) True 
 B)False

Question 3

Ages of Jockeys: The following data represent the ages in years of a sample of 25 jockeys from a local race track: 31, 43, 56, 23, 49, 42, 33, 61, 44, 28, 48, 38, 44, 35, 40, 64, 52, 42, 47, 39, 53, 27, 36, 35, and 20.
-Compute the interquartile range of the data, and interpret its meaning.

Accepted Answer

IQR = Q₃ - Q_1<

Question 4

The ____________________ measures the spread between the middle 50% of the observations.

Accepted Answer

The answer of The ____________________ measures the spread between the...

Question 5

____________________ are extremely large or extremely small observations.

Accepted Answer

The answer of ____________________ are extremely large or extremely small...

Question 6

In a negatively skewed distribution, the mean is smaller than the median and the median is smaller than the mode.

Accepted Answer

A) True 
 B)False

Question 7

Hours Worked per Week: The following data represent the hours worked per week of a sample of 25 employees from a government department: 31, 43, 56, 23, 49, 42, 33, 61, 44, 28, 48, 38, 44, 35, 40, 64, 52, 42, 47, 39, 53, 27, 36, 35, and 20.
-Find the median hours.

Accepted Answer

The answer of Hours Worked per Week: The following data...

Question 8

Ages of Retirees: A sociologist recently conducted a survey of retirees over 65 years of age whose net worth is too high to qualify for Medicaid and who have no private health insurance. The ages of 20 uninsured retirees were as follows: 65, 66, 67, 68, 69, 70, 71, 73, 74, 75, 78, 79, 80, 81, 86, 87, 91, 92, 94, and 97.
-Calculate the first quartile of the ages of the uninsured retirees.

Accepted Answer

Location = 5.25, and

Question 9

The median of an ordered data set with 30 items would be the average of the 15th and the 16th observations.

Accepted Answer

A) True 
 B)False

Question 10

Which of the following types of data has no measure of variability?

Accepted Answer

A)  Interval data 
B)  Nominal data 
C)  Bimodal data 
D)  None of these choices. 
A)  Interval data 
B)  Nominal data 
C)  Bimodal data 
D)  None of these choices.

Question 11

In a histogram, the proportion of the total area which must be to the right of the mean is exactly 0.50 if the distribution is symmetric and unimodal.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following is a property of r, the coefficient of correlation?

Accepted Answer

A)  r always lies between 0 and 1. 
B)  r has no units. 
C)  If you switch the values of X and Y, the sign of r changes. 
D)  All of these choices are true. 
A)  r always lies between 0 and 1. 
B)  r has no units. 
C)  If you switch the values of X and Y, the sign of r changes. 
D)  All of these choices are true.

Question 13

In a positively skewed distribution, which of the following is the correct statement?

Accepted Answer

A)  The distance from Q1 to Q2 is larger than the distance from Q2 to Q3 
B)  The distance from Q1 to Q2 is smaller than the distance from Q2 to Q3 
C)  The distance from Q1 to Q2 is twice the distance from Q2 to Q3 
D)  The distance from Q1 to Q2 is half the distance from Q2 to Q3. 
A)  The distance from Q1 to Q2 is larger than the distance from Q2 to Q3 
B)  The distance from Q1 to Q2 is smaller than the distance from Q2 to Q3 
C)  The distance from Q1 to Q2 is twice the distance from Q2 to Q3 
D)  The distance from Q1 to Q2 is half the distance from Q2 to Q3.

Question 14

Which of the following summary measures is sensitive to extreme values?

Accepted Answer

A)  The median 
B)  The interquartile range 
C)  The mean 
D)  The first quartile 
A)  The median 
B)  The interquartile range 
C)  The mean 
D)  The first quartile

Question 15

Which measures of central location and variability are considered to be resistant to extreme values?

Accepted Answer

A)  The mean and standard deviation. 
B)  The mode and variance. 
C)  The median and interquartile range. 
D)  None of these choices. 
A)  The mean and standard deviation. 
B)  The mode and variance. 
C)  The median and interquartile range. 
D)  None of these choices.

If the standard deviation of x is 18, the covariance of x and y is 120, the coefficient r = 0.90, then the standard deviation of y is 54.87.

The coefficient of variation allows us to compare two sets of data based on different measurement units.

Ages of Jockeys: The following data represent the ages in years of a sample of 25 jockeys from a local race track: 31, 43, 56, 23, 49, 42, 33, 61, 44, 28, 48, 38, 44, 35, 40, 64, 52, 42, 47, 39, 53, 27, 36, 35, and 20. -Compute the interquartile range of the data, and interpret its meaning.

The ____________________ measures the spread between the middle 50% of the observations.

____________________ are extremely large or extremely small observations.

In a negatively skewed distribution, the mean is smaller than the median and the median is smaller than the mode.

Hours Worked per Week: The following data represent the hours worked per week of a sample of 25 employees from a government department: 31, 43, 56, 23, 49, 42, 33, 61, 44, 28, 48, 38, 44, 35, 40, 64, 52, 42, 47, 39, 53, 27, 36, 35, and 20. -Find the median hours.

The median of an ordered data set with 30 items would be the average of the 15^th and the 16^th observations.

Which of the following types of data has no measure of variability?

In a histogram, the proportion of the total area which must be to the right of the mean is exactly 0.50 if the distribution is symmetric and unimodal.

Which of the following is a property of r, the coefficient of correlation?

In a positively skewed distribution, which of the following is the correct statement?

Which of the following summary measures is sensitive to extreme values?

Which measures of central location and variability are considered to be resistant to extreme values?

What Is Statistics

Graphical and Tabular Descriptive Techniques

Data Collection and Sampling

Probability

Random Variables and Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions

Introduction to Estimation

Introduction to Hypothesis Testing

Inference About a Population

Inference About Comparing Two Populations, Part 1

Inference About Comparing Two Populations, Part 2

Analysis of Variance

Chi-Squared Tests

Simple Linear Regression and Correlation

Multiple Regression

Review of Statistical Inference

Filters

Exam 3: Numerical Descriptive Techniques

If the standard deviation of x is 18, the covariance of x and y is 120, the coefficient r = 0.90, then the standard deviation of y is 54.87.

The coefficient of variation allows us to compare two sets of data based on different measurement units.

Ages of Jockeys: The following data represent the ages in years of a sample of 25 jockeys from a local race track: 31, 43, 56, 23, 49, 42, 33, 61, 44, 28, 48, 38, 44, 35, 40, 64, 52, 42, 47, 39, 53, 27, 36, 35, and 20. -Compute the interquartile range of the data, and interpret its meaning.

The ____________________ measures the spread between the middle 50% of the observations.

____________________ are extremely large or extremely small observations.

In a negatively skewed distribution, the mean is smaller than the median and the median is smaller than the mode.

Hours Worked per Week: The following data represent the hours worked per week of a sample of 25 employees from a government department: 31, 43, 56, 23, 49, 42, 33, 61, 44, 28, 48, 38, 44, 35, 40, 64, 52, 42, 47, 39, 53, 27, 36, 35, and 20. -Find the median hours.

The median of an ordered data set with 30 items would be the average of the 15th and the 16th observations.

Which of the following types of data has no measure of variability?

In a histogram, the proportion of the total area which must be to the right of the mean is exactly 0.50 if the distribution is symmetric and unimodal.

Which of the following is a property of r, the coefficient of correlation?

In a positively skewed distribution, which of the following is the correct statement?

Which of the following summary measures is sensitive to extreme values?

Which measures of central location and variability are considered to be resistant to extreme values?

What Is Statistics

Graphical and Tabular Descriptive Techniques

Data Collection and Sampling

Probability

Random Variables and Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions

Introduction to Estimation

Introduction to Hypothesis Testing

Inference About a Population

Inference About Comparing Two Populations, Part 1

Inference About Comparing Two Populations, Part 2

Analysis of Variance

Chi-Squared Tests

Simple Linear Regression and Correlation

Multiple Regression

Review of Statistical Inference

Filters

The median of an ordered data set with 30 items would be the average of the 15^th and the 16^th observations.