The Certified Six Sigma Green Belt Handbook - ASQ Groups

The Certified Six Sigma Green Belt Handbook
ERRATA
Page 259
Procedure and example.
Point 5 in procedure: In denominator, the “division sign” under the square root sign should be “multiplied by”
5. Calculate the test statistic using
Z
The above Formula should read as:
Z
p'
np
0
0
np (1 p
0
)
x np
0
0
np (1 p
Where p’ = sample proportion = x/n
p = population proportion
n = number of samples
x = number of items in the sample with the defined attribute
p 0 = the hypothesized proportion
0
)
Example, Step 5:
z
0.03 0.02
0.020.98
500
Above error should be corrected as:
1.597
z
15 10
0.02
0.98500
1.597
18