Lecture 6 - Sections 3-1 to 3-2 Measures of center Introduction What we have done so far Introduction What we have done so far I we have discussed

# Lecture 6 - Sections 3-1 to 3-2 Measures of center...

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Sections: 3-1 to 3-2: Measures of center
Introduction What we have done so far:
Introduction What we have done so far: I we have discussed various methods of collecting sample data.
Introduction What we have done so far: I we have discussed various methods of collecting sample data. I we then learned to summarize the sample data using frequency distribution; we also visualized the data using histogram and other graphs.
Introduction What we have done so far: I we have discussed various methods of collecting sample data. I 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 the “ variation ” of the data. We will also discuss other related ideas.
Measure of the center: Mean The measure of the center of the data is a value at the center or the middle of the data set.
Measure of the center: Mean The measure of the center of the data is a value at the center or the middle of the data set. We will talk about two notions of the center of the data, namely the mean and the median .
Measure of the center: Mean The measure of the center of the data is a value at the center or the middle of the data set. We will talk about two notions of the center of the data, namely the mean and the median . Mean or Average : this is a measure of the center of the data set, which is obtained by adding all the data values and then dividing by the number of data values in the set.
Measure of the center: Mean The measure of the center of the data is a value at the center or the middle of the data set. We will talk about two notions of the center of the data, namely the mean and the median . Mean or Average : this is a measure of the center of the data set, which is obtained by adding all the data values and then dividing by the number of data values in the set. The mean of the data is also called the Arithmetic mean .
Measure of the center: Mean Notations: P denotes the sum of a set of values: pronounced sigma
Measure of the center: Mean Notations: P denotes the sum of a set of values: pronounced sigma x is a variable usually used to to represent the individual data values
Measure of the center: Mean Notations: P denotes the sum of a set of values: pronounced sigma x is a variable usually used to to represent the individual data values n represents the number of data values in a sample
Measure of the center: Mean Notations: P denotes the sum of a set of values: pronounced sigma x is a variable usually used to 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
Measure of the center: Mean Notations: P denotes the sum of a set of values: pronounced sigma x is a variable usually used to 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: x = P x n (call it x -bar)