Numerical Stats

# Numerical Stats - Descriptive Statistics Numerical Summary...

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Descriptive Statistics Numerical Summary

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2 Summation Notation Observations in a dataset are denoted by { x 1 ,x 2 ,x 3 ,x 4 ,.... x n }; n = sample size x 1 is the first observation, x 2 is 2nd obs. and so on. We use x i to denote x 1 + x 2 + x 3 + x 4 +.…+ x n In particular,
3 Example 5.0 Suppose a dataset contains obs . {3.5,11.2,8,.4,5.4}, Then n=5 , and Not Same

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4 Population and Sample POPULATION Collection of all the units that we are interested in studying. SAMPLE A subset of the units of the population.
5 Numerical Summary Want to summarize the data using numerical descriptive measures. Two quantities to measure: I. CENTER Measure of central tendency III. VARIABILITY Spread of the data Both population and sample data can be summarized.

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6 Central Tendency We want to locate the center of the data in three ways MEAN MEDIAN MODE
7 Mean MEAN (also called the Arithmetic Mean) is the average of a group of numbers. Applicable for quantitative data

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## Numerical Stats - Descriptive Statistics Numerical Summary...

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