Jawapan Ujian:

1

(a) draw a histogram

(b) mean=51.7

(c) median=51.95

(d) IQR = 34.04

(e) variance=485.502

2

(a) draw a scatter diagram

(b) Rs = -0.1

Spearman rank correlation is used because: (i)Data not normally distributed , (ii)Data is rank

3

(a) 17.1388 and 22.8612

(b) percentage rejected is 18.14%

(c) (i) X Z/2 /n = 16.2 0.575

(ii) 636 workers

4

(a) Y = -1.7 + 0.84X

(b) y = 3.172