# PSYB01H3 Chapter 12: Chapter 12

## Document Summary

2 reasons for using statistics: statistics are used to describe date, used to make inferences on the basis of the sample data about a population. 4 scales of measurement: nominal have no numerical, quantitative properties. Ex: eye colour, birth order: ordinal - involve minimal quantitative distinction. We can rank order the levels of the varable being studied from lowest to highest. Ex: most important problem to least importance such as gang violence could be the first one. Interval & ratio - have much more detailed quantitive properties. With an interval scale, the intervals between the levels are equal in scale. In ratio scale variables, they have both equal intervals an an absolute zerio point that indicates the absence of the variable being measured. So after getting the reults, you calculate it inro percentage. Note: we are focusing on percentage because the travel variable is.