3.An old film is treated with a chemical in order to improve the contrast. Preliminary tests on nine samples drawn from a segment of the film produced the following results.

Sample

A

B

C

D

E

F

G

H

I

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

49

60

66

62

72

64

89

90

96

The quantity is a measure of the amount of chemical applied, and ???? is the contrast index, which takes values between 0 (no contrast) and 100 (maximum contrast).

(i)Plot a scatter diagram to illustrate the data. (3 marks)

(ii) It is subsequently discovered that one of the samples of film was damaged and produced an incorrect result. State which sample you think this was and justify your answer.(2 marks)