Question 1

All but one of the statements below contain a mistake.Which one could be true?

Accepted Answer

A)  The correlation between the height of a bean plant and the day is 0.78 in/day.
B)  The correlation between the time it takes to get ready in the morning and gender is 0.78.
C)  The correlation between your golf score and the number of hours you practice is -0.36.
D)  The number of apricots on a tree and the amount of fertilizer have a 1.12 correlation.
E)  There is a strong correlation between type of preferred pet and income level.

Question 2

A correlation of zero between two quantitative variables means that

Accepted Answer

A)  there is no linear association between the two variables.
B)  re-expressing the data will guarantee a linear association between the two variables.
C)  there is no association between the two variables.
D)  we have done something wrong in our calculation of r.
E)  none of these

Question 3

The following scatterplot shows a relationship between x and y that results in a correlation coefficient of r = 0.Explain why r = 0 in this situation even though there appears to be a strong relationship between the x and y variables.

Accepted Answer

The correlation coefficient on...

Question 4

A small independent organic food store offers a variety of specialty coffees.To determine Whether price has an impact on sales, the managers kept track of how many pounds of each Variety of coffee were sold last month.Based on the scatterplot shown below, which of the Following statements is true?

Accepted Answer

A)  The quantitative variable condition is satisfied.
B)  The linearity condition is satisfied.
C)  There are no obvious outliers.
D)  All of the above.
E)  None of the above.

Question 5

Given the increase of people carrying their pets in public, a news reporter takes a survey of individuals about this trend.The reporter concludes, "There appears to be a strong correlation between bringing your pet to public places and the happiness of an individual." Comment on this observation.

Accepted Answer

The variables - owning a pet a...

Question 6

The disadvantage of re-expressing variables is that

Accepted Answer

A)  We have to explain the association in terms of the transformed variables.
B)  We cannot use the standard regression models
C)  It is not commonly used
D)  It can be difficult
E)  A and D

Exam 6: Scatterplots, Association, and Correlation

The disadvantage of re-expressing variables is that

Correct Answer
verified

All but one of the statements below contain a mistake.Which one could be true?

Correct Answer
verified

The following scatterplot shows a relationship between x and y that results in a correlation coefficient of r = 0.Explain why r = 0 in this situation even though there appears to be a strong relationship between the x and y variables.

Correct Answer
verified
The correlation coefficient on...
View Answer

A correlation of zero between two quantitative variables means that

Correct Answer
verified

Given the increase of people carrying their pets in public, a news reporter takes a survey of individuals about this trend.The reporter concludes, "There appears to be a strong correlation between bringing your pet to public places and the happiness of an individual." Comment on this observation.

Correct Answer
verified
The variables - owning a pet a...
View Answer

A small independent organic food store offers a variety of specialty coffees.To determine Whether price has an impact on sales, the managers kept track of how many pounds of each Variety of coffee were sold last month.Based on the scatterplot shown below, which of the Following statements is true?

Correct Answer
verified

Exam 6: Scatterplots, Association, and Correlation

The disadvantage of re-expressing variables is that

Correct AnswerverifiedShow Answer

All but one of the statements below contain a mistake.Which one could be true?

Correct AnswerverifiedShow Answer

The following scatterplot shows a relationship between x and y that results in a correlation coefficient of r = 0.Explain why r = 0 in this situation even though there appears to be a strong relationship between the x and y variables.

Correct AnswerverifiedThe correlation coefficient on...View AnswerShow Answer

A correlation of zero between two quantitative variables means that

Correct AnswerverifiedShow Answer

Given the increase of people carrying their pets in public, a news reporter takes a survey of individuals about this trend.The reporter concludes, "There appears to be a strong correlation between bringing your pet to public places and the happiness of an individual." Comment on this observation.

Correct AnswerverifiedThe variables - owning a pet a...View AnswerShow Answer

A small independent organic food store offers a variety of specialty coffees.To determine Whether price has an impact on sales, the managers kept track of how many pounds of each Variety of coffee were sold last month.Based on the scatterplot shown below, which of the Following statements is true?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
The correlation coefficient on...
View Answer

Correct Answer
verified

Correct Answer
verified
The variables - owning a pet a...
View Answer

Correct Answer
verified