Question 1

The difference between the largest and smallest values in an ordered array is called the range.

Accepted Answer

A) True 
 B)False

Question 2

A media article claimed that there was a correlation between the colour of a car and the likelihood of a car being in an accident. What is wrong with this statement?

Accepted Answer

The answer of A media article claimed that there was...

Question 3

A courier company is reviewing their delivery times. The following descriptive statistics relates to this courier company. The mean time for package delivery is 5 hours, the first quartile is 4 hours, the third quartile is 17 hours. This means that the median must lie between 4 hours and 17 hours.

Accepted Answer

A) True 
 B)False

Question 4

The value of the standard deviation may be either positive or negative, while the value of the variance will always be positive.

Accepted Answer

A) True 
 B)False

Question 5

A linear regression model estimating the relationship between Expenditure on exports ($) and Annual household income ($) is as follows:
Estimated Expenditure on Exports = 3.55 − 0.02Annual household income
Interpret the slope.

Accepted Answer

The answer of A linear regression model estimating the relationship...

Question 6

The frequency histogram for the heights (in cm) of the 25 students in a business statistics class is given below.  What is the best measure of central location?

Accepted Answer

The answer of The frequency histogram for the heights (in...

Question 7

Which of the following summary measures cannot be easily approximated from a box-and-whisker plot? $\begin{array}{|l|l|}
\hline  A&\text { The range.}\
\hline  B&\text { The interquartile range.}\
\hline  C&\text { The second quartile.}\
\hline  D&\text {The standard deviation. }\
\hline  E&\text {All of these choices are correct. }\
\hline 
\end{array}$

Accepted Answer

The answer of Which of the following summary measures cannot...

Question 8

Which of the following may be answered by knowing the shape of the distribution? $\begin{array}{|l|l|}
\hline  A&\text {What is the best measure of central location to use. }\
\hline  B&\text {What is the best measure of variability to use. }\
\hline  C&\text { What the best measure of central location and variability to use.}\
\hline  D&\text { None of these choices are correct.}\
\hline 
\end{array}$

Accepted Answer

The answer of Which of the following may be answered...

Question 9

The interquartile range is found by taking the difference between the 1st and 3rd quartiles and dividing that value by 2.

Accepted Answer

A) True 
 B)False

Question 10

Is the following histogram constructed from the weight data unimodal, bimodal or multimodal?

Accepted Answer

The answer of Is the following histogram constructed from the...

Exam 5: Numerical Descriptive Measures

The difference between the largest and smallest values in an ordered array is called the range.

A media article claimed that there was a correlation between the colour of a car and the likelihood of a car being in an accident. What is wrong with this statement?

A courier company is reviewing their delivery times. The following descriptive statistics relates to this courier company. The mean time for package delivery is 5 hours, the first quartile is 4 hours, the third quartile is 17 hours. This means that the median must lie between 4 hours and 17 hours.

The value of the standard deviation may be either positive or negative, while the value of the variance will always be positive.

A linear regression model estimating the relationship between Expenditure on exports ($) and Annual household income ($) is as follows: Estimated Expenditure on Exports = 3.55 − 0.02Annual household income Interpret the slope.

The frequency histogram for the heights (in cm) of the 25 students in a business statistics class is given below. What is the best measure of central location?

The interquartile range is found by taking the difference between the 1st and 3rd quartiles and dividing that value by 2.

Is the following histogram constructed from the weight data unimodal, bimodal or multimodal?