1. The following four data pairs have been obtained: (1, 5), (2, 6), (4, 9), (5, 11). Without carrying out
any calculations, which of the following correlation coefficients best describes the relationship between x
and y?
A.-0.98
B.-0.25
C.0.98
D.0.25 (2 marks)
2. A company's management accountant is analysing the reject rates achieved by 100 factory operativesworking in identical conditions.
Reject rates, Y%, are found to be related to months of experience, X, by this regression equation ： Y = 20 - 0.25X. (The correlation coefficient was r = -0.9.)
Using the equation, what is the predicted reject rate for an operative with 12 months' experience?
A. 17%
B. 19%
C 20%
D 23%
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