STAT 1100 Chapter Notes - Chapter 3: Percentile, Interquartile Range, Box Plot
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A parameter is a measure computed us- ing the entire population. Parameters remain xed as long as the population does not change. An statistic is a measure computed using a sample of the population. By its nature, statistics are sample-dependent so you could compute different numbers even if you are drawing sam- ples from the same population. The population mean, also called just the mean or aver- age, it is denoted by the greek letter (mu), and it"s de- Consider a population repre- sented by a variable x, and a total of n observations of x, denoted by x1, x2, . This is the rst statistic we are going to compute. The sample mean is the average of all values in a popula- tion sample. Consider a sample of a variable x, denoted by the set {x1, , . , xn}, where n is the size of the sam- ple.
