MAT 2379 Lecture Notes - Lecture 12: Standard Deviation, Bar Chart, Continuous Or Discrete Variable

• School: University of Ottawa
• Department: Mathematics
• Course: MAT 2379
• Professor: Maryam Sohrabi

Document Summary

The population is the sample space of which we need to draw conclusions. The variables are the characteristics of the population that we are interested in. For example, if we are studying the age and weight of a population of 5000 people, the variable are x= age, y= height. Since the population is too large to examine, we need to draw a sample of the population and make conclusions about the whole population based on that sample. Categorical variables are variables which are observed qualitatively rather than quantitatively, eg. colour, shape. Quantitative variables: variables which are quantitatively measured i. e. they have numerical value. Discrete: these have specific values eg. age. Continuous: these can take a range of values eg. height, weight. A bar chart is used to show the results for categorical variables, each bar has to have the same width, but has different heights according to the frequency of that trait.