# STAT 101 Chapter Notes - Chapter 1: Round-Off Error, Eye Color, Time Series

## Document Summary

Individuals and variables individuals objects described by a set of data (ex. People, animals, things) variable any characteristics of an individual (ex. Eye colour etc) categorical variable places individuals into one of several groups/categories quantitative variable takes numerical value; usually recorded in unit of measurement (ex. Each percent is rounded to nearest tenth: roundoff error just effect of rounding off results. 10: 12. 6+12. 5+2. 5 = 67. 3 sum of audience shares; 32. 7% for other formats, it can b/c the sum can add up to a 100. 1. 4how do students pay for college (pg. 11: not correct to use pie charts b/c these numbers are way too big to add up to a 100. 1. 5never on a sunday (pg. 11: no, values are way too big and they don"t add up to a 100. Histogram vs bar graphs bar graph compares sizes of diff. 1. 9unmarried women: b/c it"s an outlier deviates from the normal pattern, midpoint around 30; spread is 54-20= 34.