APST 207 Lecture 3: Frequency Distributions:Cental Tendency
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Can be meaningfully averaged,multiplied, divided and subtracted. Examples: # of students in a class or correct answers on a tes. The unit of measure is divisible-a case could have any value in the unit. How many hipsters are in bibo"s ? discrete. What was your grade percentage on the first lab ? continuous. How many accidents occur on 1-80 every week ? discrete. Frequency distributions are used to represent quantitative data. The easiest method is the frequency table. Histograms are visual representations of continuous quantitative data. They are created by defining discrete intervals called bins (or classes) The height of each bin is equal to the frequency of cases in that particular bin. Given that our variable is continuous we have to find a way to group it. We create bins with an appropriate interval or step size. The value you give is the upper limit of that interval. The bins must be exhaustive and mutually exclusive.
