MATH 141 Lecture Notes - Lecture 3: Standard Deviation, Variance
8 Sep 2016
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Central tendency: providing the center / location of data set: mean () - (average, median (m) (middle, mode - (most) The average of all observed values in the population. The population mean is not random because the population is unique. This looks hard but it is just taking the average of the numbers so you add up the values and then divide by the total number of values: sample mean () The sample mean is random, because sample is a randomly selected candidate. This looks hard but it is just taking the average of the numbers so you add up the values and then divide by the total number of values. Median: the value in the exact middle position. Thus 50% of the data set is less than the median and another 50% is greater than it: process. If n is odd: the median is the number in the middle position.
