Summary statistics 1a chapter 1-5

Introduction to the practice of statistics
1.1 Data

Cases Objects described by a set of data.
Label A special variable used in some data sets to distinguish the different cases.
Variable A characteristic of a case.




1.2 Displaying distributions with graphs

Distribution of a Lists the categories and gives either the count or the percent of cases that
categorical variable fall in each category.
Midpoint The value with roughly half the observations taking smaller values and half
taking larger values.
Unimodal A distribution with one major peak.

,  Percents
 Bar graph
 Pie chart

Quantitative variables:

 Stemplots
 Histograms