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relative frequency distribution

identifies the proportion or fraction of values that fall into each class.

pie chart

is a segmented circle whose segments portray the relative frequencies of the categories of a qualitative variable. (percentages)

Histograms

is a visual representation of a frequency or a relative frequency distribution Bar Chart: Relative frequency and respective class frequency and class width

Approximating class width

largest value- smallest value/ number of classes

bar chart

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

relative frequency

-CALCULATE by dividing each category's frequency by the sample size. -To express relative frequencies in terms of percentages, multiply each proportion by 100%.

Which of the following best describes a frequency distribution for qualitative data? -It groups data into histograms and records the proportion (fraction) of observations in each histogram. -It groups data into categories and records the number of observations in each category. -It groups data into intervals called classes and records the proportion (fraction) of observations in each class. -It groups data into intervals called classes and records the number of observations in each class.

It groups data into categories and records the number of observations in each category.

For both qualitative and quantitative data, what is the difference between the relative frequency and the percent frequency? -The relative frequency equals the percent frequency multiplied by 100. -The percent frequency equals the relative frequency multiplied by 100. -As opposed to the relative frequency, the percent frequency is divided by the number of observations in the data set. -As opposed to the percent frequency, the relative frequency is divided by the number of observations in the data set.

The percent frequency equals the relative frequency multiplied by 100.

Ogives

are used to display cumulative measures of QUANTITATIVE data

Polygons

are used to display the frequency and relative frequency of QUANTITATIVE data

frequency distribution

for QUALITATIVE data groups data into categories and records how many observations fall into each category. for QUANTITATVE data groups data into intervals called classes, and records the number of observations that fall into each class

cumulative relative frequency distribution

gives the proportion or fraction of values that fall below the upper limit of each class.

cumulative frequency distribution

specifies how many observations fall below the upper limit of a particular class.