Question 1

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.

Question 2

We can frequently make several inferences about the nature of the data from the ____________________ of its histogram.

Accepted Answer

The answer of We can frequently make several inferences about...

Question 3

Weights of Police Officers
The following data represent the weights in pounds of a sample of 25 police officers: 164, 148, 137, 157, 173, 156, 177, 172, 169, 165, 145, 168, 163, 162, 174, 152, 156, 168, 154, 151, 174, 146, 134, 140, and 171.
-{Weights of Police Officers Narrative} Describe the shape of the distribution of weights based on the quartiles' values.

Accepted Answer

The answer of Weights of Police Officers
The following data represent...

Question 4

Generally speaking, if two variables are unrelated, the covariance will be a number close to zero.

Accepted Answer

A) True 
 B)False

Question 5

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.
-{Ages of Retirees Narrative} Calculate the first quartile of the ages of the uninsured retirees.

Accepted Answer

The answer of Ages of Retirees
A sociologist recently conducted a...

Question 6

$\sigma$ is a population parameter and s is a sample statistic.

Accepted Answer

A) True 
 B)False

Question 7

The ____________________ mean of n returns (or growth rates) is the appropriate mean to calculate if you wish to estimate the mean rate of return (or growth rate) for any single period in the future.

Accepted Answer

The answer of The ____________________ mean of n returns (or...

Question 8

The length of the box in the box plot portrays the:

Accepted Answer

A)  median. 
B)  interquartile range. 
C)  range. 
D)  third quartile.

Question 9

A data sample has a mean of 107, a median of 122, and a mode of 134.The distribution of the data is positively skewed.

Accepted Answer

A) True 
 B)False

Question 10

When two variables x and y are linearly related, it does not necessarily mean that x ____________________ y.

Accepted Answer

The answer of When two variables x and y are...

Question 11

A basketball player has the following points for seven games: 20, 25, 32, 18, 19, 22, and 30.Compute the following measures of variability.
a.
Standard deviation
b.
Coefficient of variation
c.
Compare the standard deviation and coefficient of variation and use them to discuss the variability in the data.

Accepted Answer

The answer of A basketball player has the following points...

Question 12

In a positively skewed distribution:

Accepted Answer

A)  the median equals the mean. 
B)  the median is less than the mean. 
C)  the median is larger than the mean. 
D)  the mean can be larger or smaller than the median.

Question 13

If the mean, median, and mode are all equal, the histogram must be symmetric and bell shaped.

Accepted Answer

A) True 
 B)False

Question 14

The number of hours a college student spent studying during the final exam week was recorded as follows: 7, 6, 4, 9, 8, 5, and 10.Compute s² and s for the data and express the numbers in the appropriate unit.

Accepted Answer

The answer of The number of hours a college student...

Question 15

Q₂ is another name for the ____________________.

Accepted Answer

The answer of Q₂ is another name for the ____________________....

Question 16

Suppose your data set contains ages (in years) and you calculate the range, variance, standard deviation, and coefficient of variation for the data.Explain what units each of these measures is in.

Accepted Answer

The answer of Suppose your data set contains ages (in...

Question 17

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 18

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.
-{Ages of Retirees Narrative} Identify the interquartile range of the ages of the uninsured retirees.What does this value tell you about the data?

Accepted Answer

The answer of Ages of Retirees
A sociologist recently conducted a...

Question 19

Consider the following data:
  
a.
Calculate the covariance and the coefficient of correlation for the sample.
b.
What do these statistics tell you about the relationship between x and y?

Accepted Answer

The answer of Consider the following data:
  
a.
Calculate the...

Question 20

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.
-{Ages of Jockeys Narrative}
a.
Construct a box plot for the ages and identify any extreme values.
b.
What does the box plot tell you about the distribution of the data?

Accepted Answer

The answer of Ages of Jockeys
The following data represent the...

Exam 4: Numerical Descriptive Techniques

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

We can frequently make several inferences about the nature of the data from the ____________________ of its histogram.

Generally speaking, if two variables are unrelated, the covariance will be a number close to zero.

$\sigma$ is a population parameter and s is a sample statistic.

The ____________________ mean of n returns (or growth rates) is the appropriate mean to calculate if you wish to estimate the mean rate of return (or growth rate) for any single period in the future.

The length of the box in the box plot portrays the:

A data sample has a mean of 107, a median of 122, and a mode of 134.The distribution of the data is positively skewed.

When two variables x and y are linearly related, it does not necessarily mean that x ____________________ y.

In a positively skewed distribution:

If the mean, median, and mode are all equal, the histogram must be symmetric and bell shaped.

The number of hours a college student spent studying during the final exam week was recorded as follows: 7, 6, 4, 9, 8, 5, and 10.Compute s² and s for the data and express the numbers in the appropriate unit.

Q₂ is another name for the ____________________.

Suppose your data set contains ages (in years) and you calculate the range, variance, standard deviation, and coefficient of variation for the data.Explain what units each of these measures is in.

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

Consider the following data: a. Calculate the covariance and the coefficient of correlation for the sample. b. What do these statistics tell you about the relationship between x and y?

Exam 4: Numerical Descriptive Techniques

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

We can frequently make several inferences about the nature of the data from the ____________________ of its histogram.

Generally speaking, if two variables are unrelated, the covariance will be a number close to zero.

σ\sigmaσ is a population parameter and s is a sample statistic.

The ____________________ mean of n returns (or growth rates) is the appropriate mean to calculate if you wish to estimate the mean rate of return (or growth rate) for any single period in the future.

The length of the box in the box plot portrays the:

A data sample has a mean of 107, a median of 122, and a mode of 134.The distribution of the data is positively skewed.

When two variables x and y are linearly related, it does not necessarily mean that x ____________________ y.

In a positively skewed distribution:

If the mean, median, and mode are all equal, the histogram must be symmetric and bell shaped.

The number of hours a college student spent studying during the final exam week was recorded as follows: 7, 6, 4, 9, 8, 5, and 10.Compute s2 and s for the data and express the numbers in the appropriate unit.

Q2 is another name for the ____________________.

Suppose your data set contains ages (in years) and you calculate the range, variance, standard deviation, and coefficient of variation for the data.Explain what units each of these measures is in.

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

Consider the following data: a. Calculate the covariance and the coefficient of correlation for the sample. b. What do these statistics tell you about the relationship between x and y?

$\sigma$ is a population parameter and s is a sample statistic.

The number of hours a college student spent studying during the final exam week was recorded as follows: 7, 6, 4, 9, 8, 5, and 10.Compute s² and s for the data and express the numbers in the appropriate unit.

Q₂ is another name for the ____________________.

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