Statistics

Statistics

1. Mathematical models in probability and statistics

   • A mathematical model is a simplification of a real world situation.
   • Advantages: quick and easy to produce, can simplify a complex situation, they enable predictions to be made about the future, help provide control
   • Disadvantages: only give a partial description of real situation, only work for restricted range of values.

2. Representation and summary of data - location

   • a variable can take any value in a given range
   • a variable that can take only specific values in a given range is a discrete
   • a grouped frequency distribution consists of classes and their related class frequencies
   • the mode or modal class is the value or class that occurs most often
   • the median is the middle value of an ordered data set

3. Representation and summary of data - measures of dispersion

4. Representation of data

5. Probability

6. Correlation

7. Regression

8. Discrete random variables

9. The normal distribution