SOC222H5 Lecture Notes - Lecture 1: Percentile, Quartile, Interquartile Range
Document Summary
Inferential statistics is about making predictions data we have: descriptive statistics include frequencies, measures of central frequency and measures of dispersion. Descriptive statistics: frequency distributions: distribution of cases across each categories. In frequency table, you have to make sure that you have the same valid cases as when you started. This makes comparison possible: to get the reverse of 33%, you would do 0. 33 x the total number of cases. Cumulative frequency: same thing as cumulative percent but it just involves the frequency. It is like a bar graph with no spaces in between an interval-ratio variable. Important: you must sort the data in ascending order (from left to right) before you find the median. Important: when you have an even number of values, you must take the two middle values, add them together, then divide by 2 to get the midpoint: finding the median.
