Inferential Tests:- Parametric Tests

Inferential Tests:- Parametric Tests

1. Data must be interval

2. Data must be normally distributed (symmetrical)

3. Normal Distribution

   • Median has 50% of scores falling to each side, mode represents the highest score when the distribution of scores is plotted
     • 68% of scores lie within one standard deviation of the mean
       • 95% of scores lie within two standard deviations of the mean
         • 99.8% of scores lie within three standard deviations of the mean

4. Positive Skew

5. Negative Skew

6. Mode is affected most by a skewed distribution

7. Type 1 Error = rejecting the null hypothesis when it should be accepted

   • Type 2 Error = accepting the null hypothesis when it should be rejected

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