01:960:211 Lecture Notes - Lecture 3: Standard Deviation, Histogram

• School: Rutgers University
• Department: Statistics and Biostatistic
• Course: 01:960:211
• Professor: professor Agre

Document Summary

Class: one of the categories qualitative data can be classified. Class frequency: the number of observations in the data set falling into a particular class. Class relative frequency: the class frequency divided by the total number of observations in a data set. Class percentage: class relative frequency divided by 100. Variable: a characteristic that varies from one person or thing to another. Discrete variable: a quantitative variable whose possible values can be listed. Continuous variable: quantitative variable whose possible values form some interval of numbers. Bar graph: the categories (classes) of the qualitative variable are represented by bars, height of each bar is either class frequency, class relative frequency, or class percentage. Pie chart: classes of qualitative variable are represented by slices of a pi, each portion is proportional to the class relative frequency. Pareto diagram: bar graph with classes of the qualitative variable arranged by height in descending order from left to right.