COB 191 Chapter Notes - Chapter 2: Frequency Distribution, Categorical Variable, Bar Chart
Document Summary
Frequency distribution: shows number of data observations that fall into speciic intervals: class: each row in frequency distribution, goal of freq. distr. : identify useful pattern in data: to create freq. distr. N= number of data points class width= maximum data value minimum value k. Rules for constructing classes for grouped data: Relative frequency distribution: display proportion of observations of each class relative to total number of observations. : accumulated proportion of that class and what is less than that class (sum should equal 1/close to 1); have to calculate relative frequency distribution irst. Discrete data: values based on observations that can be counted and represented by whole numbers (have inite number of values in interval) Continuous data: values that can take on any real numbers and those with decimal points. Freq. distr. "s display qualitative data by indicating number of occurrences of various categories.
