HTHSCI 2S03 Lecture Notes - Lecture 3: Level Of Measurement, Data Cluster, Central Tendency
3 Mar 2017
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Document Summary
2 most important numbers are measures of central tendency and of dispersion. A specific data pt (the value of a variable for one subject) is represented by the capital letter x. X with a bar over top denotes mean. N denotes the number of subjects in a sample. Indicates the adding up of a series of numbers (cid:840)sum(cid:841) * x refers to a single data point. X is the value of x for subject i. n is the number of subjects (sample size) in group r. n is the total sample size. Allows us to directly compare 2 or more groups, even when they have a different # of subjects. The mean is a measure of central tendency for interval & ratio data. A measure of central tendency is the (cid:873)typical(cid:874) value for the data. The mean can often be a value that was not even present in the data.
