Statistical Sciences 1023A/B Lecture Notes - Lecture 23: Unimodality, Histogram, Standard Deviation

• School: Western University
• Department: Statistical Sciences
• Course: Statistical Sciences 1023A/B
• Professor: Jennifer Waugh

Document Summary

The mean - the typical value of a data set. Add together all of the units of data then divide them by the total number of units in order to calculate the mean. This is the most typical value of the data. This value separates the lower and upper half of the data set. It is the midpoint of the data - 15 values it would be value #8. The mode - most common value in data set. Differences b/w max and min (the lowest and highest values) Subtract the low from the high in order to find out the range. Average distance of values from their mean (typical value) Graphs that summarize the distribution of quantitative data. Vertical axis can be either frequency or relative frequency (% or proportion) The bin size matters - changes the look/ clarity of the graph. Symmetry: whether histogram looks like mirror image (left to right)