APA 3381 Lecture Notes - Lecture 2: Decimal Mark, Frequency Distribution
16 Sep 2017
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Document Summary
Data collected from studies are first organized in tables and then presented in graphical form. Graphs can help understand the data better and draw conclusions: the histogram is a graph of a frequency distribution in which the bar heights correspond to class frequencies and the bar widths represent class widths. Distributions can be bell-shaped, uniform, right (or positive-skewed), left (or negative-skewed), or bimodal. Pareto charts, also known as bar charts, are the equivalent of histograms for qualitative data. Stem and leaf plots: a stem-and-leaf graph consists of stems and leafs. The leaves represent the last digit on the right and the stems are the remaining digits. For example, the number 2. 89 would result in a leaf of 9 and a stem of 28. To account for the decimal point, a leaf unit must be determined. The number would be represented as 28|9, with leaf unit 0. 01.
