Test of significance: z-test
- Test is given by = standard normal deviate
(SND or z) - SND expresses the difference in standard error
units on a standard normal curve with = 0 and =1 - For our example, SND = = 2.78
SEX
X
1. 8 / 100
3. 5 3. 0
-1.96 =3.0^
n
+1.96
n
0.475 0.475 SND=2.78