Business Statistics

726 Business Statistics

Friedman Test Statistic

2 2

1

12

3 ( 1)

( 1)

k

r j

j

R b k

bk k

=

= − +

+

∑



where k is the number of treatment levels (columns), b the number of blocks (rows)

2

j

R

the rank total for a particular treatment (column),

and j the particular treatment level.

Spearman’s rank correlation

2

2

6

1

( 1)

s

d

r

n n

= −

−

∑

where n is the number of paired observations and, d the difference in ranks for each pair of observation.

1. A quality control inspector has discovered that a newly installed

machine is producing some defective products. He has obtained

22 products selected randomly from the machine operator to

check this. The operator has given him 22 ...