The normal distribution is a theoretical distribution but it allows us to make descriptive statements about a raw scores that are randomly sampled from empirical distributions that may be assumed normal.
| The difference between theoretical and empirical distributions confuses you? Click here to compare the two. |
The normal curve table allows us to determine the total area 1) above or below a score and 2)between two scores.
| Click here to view David Lane's interactive calculators for the normal distribution. |
Depending on the what is required by a normal curve problem, the area under the normal curve may be expressed as
- proportion of cases/respondents/students
- percentage of cases when multiplied by 100
- number of respondents when multiplied by N (sample size).
Review: Click the provided links 1) to check your mastery of the lesson and 2) prepare for the 3rd exam on 11 January 2008.
- Review 1 (This is NOT a graded activity. This is a copy of the questions we used in class. A link is provided if you wish to check your answers.)
- Graded Review 1 (Due: before the start of our 9 January 2008 class)
- Answers to Graded Review 1
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