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Descriptive Statistics(1)(1)

# Descriptive Statistics(1)(1) - Descriptive Statistics Click...

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3/20/11 Descriptive Stats Descriptive statistics are used to describe data, i.e., descriptive statistics are used to summarize data in order to communicate information about the data set in a concise manner. measures of center measures of variation measures of position
3/20/11 Measures of Center Measure of Center Value at the ‘middle’ of a data set Mean Median Mode

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3/20/11 Measures of Center Mean (Arithmetic) The sum of all the values divided by the total number of values Population Sample N x = μ n x x =
3/20/11 Measures of Center Median The middle value when the data are ordered If there are an even number of values, then median is the average of the two middle values e.g, if there are 20 values, the median is the average of the 10th and 11th values If there are an odd number of values, the median is just the middle value x ~

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3/20/11 Measures of Center Mode The value(s) that repeated most often If no value is repeated, the mode does not exist The mode may have more than one value
3/20/11 Measures of Center Which measure is best? The mean and median are the most commonly used The mean is affected by extreme values, while the median is not The mean takes all values into account The mean is the most reliable (varies the least) The mean is the basis for many

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Descriptive Statistics(1)(1) - Descriptive Statistics Click...

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