ch.2 notes

# ch.2 notes - Ch 2 Frequency Distributions/Graphics...

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FREQUENCY TABLE A grouping of qualitative data into mutually exclusive classes - showing the number of observations in each class. BAR CHART A graph in which the classes are reported on the horizontal axis and - the class frequencies on the vertical axis. The class frequencies are proportional to the heights of the bars. PIE CHART A chart that shows the proportion or percent that each class - represents of the total number of frequencies. FREQUENCY DISTRIBUTION A grouping of quantitative data into mutually exclusive - classes showing the number of observations in each class. Frequency Distribution a grouping of data into mutually exclusive classes showing the number ( frequency or count ) of observations in each class. A useful recipe to determine the number of classes (k) is the “2 to the k rule.” This guide suggests you select the smallest number (k) for the number of classes such that 2k (in words, 2 raised to the power of k) is greater than the number of observations (n).

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