BIOCH499A Chapter 2-6: Chapters 2-6.pdf
14 Feb 2014
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Qualitative or categorical data: nominal and ordinal data. Quantitative data or measurement data: discrete and continuous data. Numerical measures of central tendency: mean, median, and mode, Numerical measures of variation: range, inter-quartile range, and standard deviation. Chapters 2 - 6: exploring and understanding data . Definition: a variable is any characteristic of a person or thing that can be expressed as a number or a label. Example 1: the blood types of 40 persons who have volunteered to donate blood at a plasma center are recorded in the following: A a ab a b a a o o a. O o a a a o a o o ab (a) summarize the data in a frequency table. /40 = (b) create graphical displays of data. Example 2: the daily numbers of computer stoppages observed over 30 days at u of r computing center are recorded in the following:
