In airplane manufacturing, rivets are used to join parts. The following table gives the number of

oversize rivet holes and the number of minor repairs on 12 sections of an airplane.

Oversized Minor

Rivet Holes Repairs

46 22

52 26

48 21

60 28

67 33

61 32

70 33

54 25

52 34

67 35

48 26

57 30

a) Construct a scatterplot for this data.

b) Find the correlation measure r. for these two variables.

c) Add a regression line and regression equation to the scatterplot.

d) Use the results to discuss the relationship between these two variables.

e) Use the regression to predict the number of minor repairs when the number of oversized rivet

holes is 40.