- Used to determine the probability of obtaining random samples with different means
- Many samples and populations contain data that fit a normal distribution
- Can be used for basis of statistical testing
Characteristics
- Bell Curve
- most values near the middle datum or average of the sample
- very few values near the upper and lower extremes
- Data fit the formula of a normal distribution
- Y= frequency of a value of x
Deviations from a Normal Distribution
- Asymmetric Deviations
- Skewed distributions
- Skewed to the right= pos. skewed
- Skewed to the left= neg. skewed
- Mathematical Analysis of skewness
- Kurtic Deviations
- Platykurtic
- Leptokurtic
- Mathematical analysis of kurtosis
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