Lecture%206

# Lecture%206 - Chapter 3: So far we have discussed various...

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Chapter 3: So far we have discussed various methods of collecting sample data. We then learned to summarize the sample data using frequency distribution; we also visualized the data using histogram and other graphs. In the next two lectures, we will talk about ideas to describe the `` center ’’ and the `` spread ’’ or `` variation ’’ of the data. We will also discuss other related ideas.

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Measure of Center: the value at the center or middle of a data set Arithmetic Mean (Mean) the measure of center obtained by adding the values and dividing the total by the number of values The mean of the data is also known as the average .
Some notations : Σ denotes the sum of a set of values. x is the variable usually used to represent the individual data values. n represents the number of data values in a sample. N represents the number of data values in a population. Sample mean: gG = Σ x / n (call it x-bar) Population mean: µ = Σ x / N (pronounced as ``mu’’)

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## This note was uploaded on 12/27/2011 for the course MATH 121 taught by Professor Banerjee during the Fall '11 term at Syracuse.

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Lecture%206 - Chapter 3: So far we have discussed various...

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