A study on driving speed (miles per hour) and fuel efficiency (MPG: miles per gallon) for midsize automobiles resulted in the data listed.

Speed (Miles/Hour) MPG (Miles/Gallon)

30 28

50 25

40 25

55 23

30 30

25 32

60 21

25 35

50 26

55 25

1) Which vaiable is the dependent variable?

2) Which variable is the independent variable?

3) Construct a scatter diagram with dependent variable on the vertical axis (Y) and the independent variable on the horizontal axis (x) Please label the chart and the axis.

4) What does the plot show about the relationship between the two variables? If yes, positive or negative? Weak or strong?

5) Compute the correlation of co-efficient of the two variables

6) What can you say about the linear relationship of the two variables based on the correlation coefficient?