E280 chapter 2 unit b exam 1
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Frequency distribution
for qualitative data groups data into categories and records the number of observations that fall into each category

relative frequency
of each equals the proportion (fraction of observations in each category. A category's relative frequency is calculated by dividing the frequency by the total number of observations. the sum of the relative frequencies should equal one

percent frequency
is the percent of observations in a category; it equals the relative frequency of the category multiplied by 100%

pie chart
is a segmented circle whose segment portray the relative frequencies of the categories of some qualitative variables

bar chart
depict the frequency or the relative frequency for each category of the qualitative data as a bar rising vertically from the horizontal axis

for quantitative data, a frequency distribution groups data into intervals called classes, and records the number of observations that falls into each class

cumulative frequency distribution
records the number of observations that falls below the upper limit of each class

relative frequency distribution
 for quantitative dat, a relative frequency distribution identifies the proportiom(of the fraction) of values that fall into each class, that is
 class RF=Class frequency
 total number of values

cumulative relative frequency distribution
records the proportion (or the fraction) of values that fall below the upper limit of each class

histogram
is a series of rectangles where the width and height of each rectangle represent the class width and frequency( or relative frequency) of the respective class

ogive
is a graph that plots the cumulative frequency or the cumulative relative frequency of each class against the upper limit of the corresponding class

scatterplot
is a graphical tool that helps in determining whether or not two variables are related in some systematic way. Each point in the diagram represents a pair of know or observed values of the two variables