Analyzing Two Variable Data

Describe the association between the number of lanes rented and the number of people bowling.

• Non-linear association

• Negative linear association

• No association

• Positive linear association

Which scatter plot shows a negative relationship?

• Graph A

• Graph B

• Graph C

• Graph D

Tags

CCSS.8.EE.B.5

Describe the association for the scatterplot based on data plotted.

• As the weeks increase, the amount of money on the gift card increases.

• As the weeks decrease, the amount of money on the gift card increases.

• There is no relationship between the time in weeks and the amount of dollars.

• As the weeks increase, the amount of money on the gift card decreases.

The police department tracked the number of ticket writers and number of tickets issued for the past 8 weeks.  The scatter plot shows the results.  Which statement is true?

• More ticket writers results in fewer tickets issued.

• There were 50 tickets issued every week.

• When there are 10 ticket writers, there will be 800 tickets issued.

• More ticket writers results in more tickets issued.

Mr. Thomas wanted to know if the amount of class time that he gave students to study affected their test scores.  What kind of relationship between class study time and test scores is shown on the scatter plot.

• No correlation

• Positive correlation

• Negative correlation

• Positive then negative correlation

The following scatterplot describe the relationship between height (in cm) and foot length (also in cm) for 12 randomly selected students from the British Census @ Schools database. Which of the following is the best description of this relationship?

• There is some random variation, but otherwise height is directly proportional to foot length.

• There is a roughly linear relationship between height and foot length.

• There is a moderate to weak, positive linear relationship between height and foot length.

Tags

CCSS.HSF.LE.B.5

Which correlation coefficient best matches the given scatterplot?

• r = 0.8

• r = 0.08

• r = - 0.8

• r = - 0.08

Estimate the correlation coefficient

• r = 1

• r = -1

• r ≈ -0.8

• r ≈ 0.8

• r ≈ -0.5

What would happen to the correlation if the number of people bowling was on the horizontal axis and the number of lanes rented was on the vertical axis?

• The correlation would change because it distinguishes between the explanatory and response variables.

• The correlation would stay the same because it does not distinguish between the explanatory and response variables.

• The correlation would change because changing the units of measurement changes the correlation.

• The correlation would stay the same because changing the units of measurement does not change the correlation.

Which conclusion is best supported by the scatterplot?

• As the length of a call increases, the cost of the call increases.

• As the length of a call increases, the cost of the call remains the same.

• As the length of a call increases, the cost of the call decreases.

• There is no relationship between the length of a call and the cost of the call.