1. Normal Distribution

2. Confidence Interval 90%

3. Level of Significance a = 10%
Confidence Interval 90%
Level of Significance a = 10%

4. Level of Significance a = 10%
Confidence Interval 90%
Level of Significance a = 10%
a / 2 = 5%
a / 2 = 5%

5. Level of Significance a = 10%
Confidence Interval 90%
Level of Significance a = 10%
a / 2 = 5%
a / 2 = 5%
-Za/2
Za/2

6. Level of Significance a = 10%
Confidence Interval 90%
Level of Significance a = 10%
a / 2 = 5%
a / 2 = 5%
-Za/2 =
Za/2 = 1.645

7. Level of Significance a = 5%
Confidence Interval 95%
Level of Significance a = 5%
a / 2 = 2.5%
a / 2 = 2.5%
-Za/2 = -1.96
Za/2 = 1.96

8. Level of Significance a = 2%
Confidence Interval 98%
Level of Significance a = 2%
a / 2 = 1%
a / 2 = 1%
-Za/2 = -2.33
Za/2 = 2.33

9. Level of Significance a = 1%
Confidence Interval 99%
Level of Significance a = 1%
a / 2 = 0.5%
a / 2 = 0.5%
-Za/2 =
Za/2 = 2.575

10. Level of Significance a = 10%
Confidence Interval 90%
Level of Significance a = 10%
a = 10%
One Tail
Za = 1.28

11. Level of Significance a = 10%
Confidence Interval 90%
Level of Significance a = 10%
a = 10%
One Tail
-Za = -1.28

12. Level of Significance a = 5%
Confidence Interval 95%
Level of Significance a = 5%
a = 5%
One Tail
Za = 1.645

13. Level of Significance a = 5%
Confidence Interval 95%
Level of Significance a = 5%
a = 5%
One Tail
-Za =

14. Level of Significance a = 2%
Confidence Interval 98%
Level of Significance a = 2%
a = 2%
One Tail
Za = 1.96

15. Level of Significance a = 2%
Confidence Interval 98%
Level of Significance a = 2%
a = 2%
One Tail
-Za/2 = -1.96

16. Level of Significance a = 1%
Confidence Interval 99%
Level of Significance a = 1%
a = 1%
One Tail
Za = 2.33

17. Level of Significance a = 1%
Confidence Interval 99%
Level of Significance a = 1%
a = 1%
One Tail
-Za = -2.33

18. One Tail
Two Tail
Confidence
Interval
Level of
Significance
Z a
Z a/2
90 %
10 %
1.28
1.645
95 %
5 %
1.96
98 %
2 %
2.33
99 %
1 %
2.575