STAT 2060 Chapter Notes - Chapter 2: Standard Deviation, Central Tendency, Box Plot
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Data: comes to us in the form of observations (measurements) which we symbolically write as. X1, x2 xn: where xi is an individual observation, and the index i = 1, . ,n, here n is referred to as a sample size, we can also write this as xi: i = 1, . ,n or in tabular form as. What is a mean: the mean of a data is obtained by adding up all of the observations and dividing by the sample size (number of observations) and we symbolically use x (with a line on top) Sigma : read the summation of x1 from i = 1 to n . What is a median: order the data from smallest to largest, the median is the middle observation, when n is odd, we middle observation is well defined. If n is even we average the middle two values.