# day5 - In Chapter 2 we summarized and describe the data...

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In Chapter 2, we summarized and describe the data using tables and graphs. In Chapter 3, we will summarize and describe the data using numbers. Sample Statistics : numbers that describe a sample Population Parameters : numbers that describe a population Measures of Location Mean : the average value A measure of the central location of the data. The population mean is denoted by μ . To compute the population mean: μ = N i =1 x i N N is the number of units in the population. The observations are x 1 ,x 2 ,...,x N . The sample mean is denoted by ¯ x . To compute the sample mean: ¯ x = n i =1 x i n n is the number of units in the sample. The observations are x 1 ,x 2 ,...,x n . 1

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Example : A sample of 10 NCAA college basketball games provided the fol- lowing winning margins (in points). 24 19 5 21 8 3 6 6 10 20 What is the average winning margin? Median : the middle value A measure of the central location of the data. To compute the median:
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## This note was uploaded on 01/24/2011 for the course STATISTICS 19897 taught by Professor Jager,abigaill during the Fall '10 term at Kansas State University.

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day5 - In Chapter 2 we summarized and describe the data...

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