STA 1020 Lecture Notes - Lecture 4: Frequency Distribution
17 Sep 2016
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Main graphs that you have to know about: Graphs should be able to stand alone without original data. Pie chart: shows how large each category is in relation to the whole; qualitative data. Multiply 360 by relative frequency to get size of each wedge. Bar graph: graphs that use bars to represent the amount of data in each category; qualitative data. The order of the bars does not matter. Bars on a bar graph do not touch. You can also use percentages instead of the numbers. Frequency histogram: a bar graph of frequency distribution of quantitative data. Relative frequency histogram: a histogram in which the heights of the bars represent the relative frequencies of each class rather than simply the frequencies. Frequency distribution is how many times a piece of quantitative data appears. The width of the bars represents class width; they should be uniform.
