Normal Distribution

Confidence Interval 90%

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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