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8 Cards in this Set
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 Back
Properties of Standard Normal Distribution

1.Bell Shaped
2.Symmetric around 0 (i.e mu=0) 3.Std.dev or sigma=1 always 4.Total area is 1 or 100% 5.Values are denoted by z's or zscore 6.Has table with area under the curve to the left of a zscore 

Other imp points

1.689599.7 rule only gives us area within 3 std.dev of mean but the Std.Norm table gives us an unlimited amount of values.
2.Purpose:use table to find area under any normal curve 3.area under curve=proportion(probability) of observations under the curve. 

POINT

Table enntry for z is the area under the std.normal curve to the left of z.


Table Components

1.The left column has ones and tenTHS digits of the score
2. The heading at the top has hundreTHS digits of z score 3. Area (probability) left of a zscore is in the body of the table 

Two ways to use Std.Normal Table

Use 1: Given z find area
Use 2: Given area find z 

Three Types of find area problems

1.Area to left of z
2. Area to the right of z 3.Area b/w to z's 

If z score is three of more decimal places

If so then we either round or we then use a calculator or a software package


Point

Z scores tell % of values under the curve and u can find that by multiplying by 100 a zscore.
