Page 24 - Math SL HB Sem 3

There are nine books on a shelf. For each book, x is the number ofpages, and is the
_u
selling price in pounds (f). Let r be the correlation coeffcient.

(a) Write down the possible minimum and maximum values of r-
[2 marks]

(b) Given that r = 0.95, which ofthe following diagrams best represents the data. p narkJ
B

.Y -T

C v D

,r -T

(c) Fol the data in diagram D, rvhich hryo ofthe following expressions clescribe
the correlation between r and v?

perfect, zero, linear, strong positive, strong negative,
weak positive. weak negative
[2 narks]

q