Question 1

The following data are the heights (in cm) of the 25 students in a business statistics class: $$\begin{array} { | l | l | l | l | l | l | l | l | l | l | } 
\hline 164 & 148 & 137 & 157 & 173 & 156 & 177 & 172 & 169 & 165 \
\hline 145 & 168 & 163 & 162 & 174 & 152 & 156 & 168 & 154 & 151 \
\hline 174 & 146 & 134 & 140 & 171 & & & & & \
\hline
\end{array}$$ a. Compute the range of the data.
b. Compute the range approximation to the standard deviation of the data. (Hint: S $\approx$ Range/4.)

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Question 2

The following data are the heights (in cm) of the 25 students in a business statistics class: $$\begin{array} { | l | l | l | l | l | l | l | l | l | l | } 
\hline 164 & 148 & 137 & 157 & 173 & 156 & 177 & 172 & 169 & 165 \
\hline 145 & 168 & 163 & 162 & 174 & 152 & 156 & 168 & 154 & 151 \
\hline 174 & 146 & 134 & 140 & 171 & & & & & \
\hline
\end{array}$$ a. Construct a box plot for the heights.
b. State the interquartile range and identify any outliers.
c. Compare the information regarding skewness conveyed by your box plot with that shown by a
histogram.

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The answer of The following data are the heights (in...

Question 3

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 4

A linear regression model estimating the relationship between Expendure on Imports and Annual household income has an r value of 0.90.
Interpret r.

Accepted Answer

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

Question 5

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?

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

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

A linear regression model estimating the relationship between Expenditure on imports($) and Annual household income($) is as follows:
Estimated Expenditure on Imports = 1.35 + 0.11Annual household income.
Interpret the slope.

Accepted Answer

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

Question 8

A linear regression model estimating the relationship between Expenditure on Imports and Annual household income has an r² value of 0.81. Interpret r².

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

Question 9

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 variability?

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

Question 10

What is wrong with this statement:
"When the sample correlation coefficient is equal to 1 then the slope of the regression line will also be equal to 1".

Accepted Answer

The answer of What is wrong with this statement:
"When the...

Quiz 5: Numerical Descriptive Measures

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.

A linear regression model estimating the relationship between Expendure on Imports and Annual household income has an r value of 0.90. Interpret r.

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?

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?

A linear regression model estimating the relationship between Expenditure on imports($) and Annual household income($) is as follows: Estimated Expenditure on Imports = 1.35 + 0.11Annual household income. Interpret the slope.

A linear regression model estimating the relationship between Expenditure on Imports and Annual household income has an r2 value of 0.81. Interpret r2.

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 variability?

What is wrong with this statement: "When the sample correlation coefficient is equal to 1 then the slope of the regression line will also be equal to 1".

A linear regression model estimating the relationship between Expenditure on Imports and Annual household income has an r² value of 0.81. Interpret r².