lecture4ccle

# lecture4ccle - Examining Numerical Data(finish Categorical...

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Examining Numerical Data (finish) & Categorical Data Statistics 10 - Lecture 4 VIVIAN LEW UCLA DEPARTMENT OF STATISTICS SPRING 2015

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FORMULAS, FYI NO NEED TO MEMORIZE
Take aways The sample variance is approximately the average squared distance from the mean. The standard deviation is the square root of the variance. In Stat 10, the standard deviation is used when judging the nearness of the data to the mean.

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POPULATION VARIANCE AND STANDARD DEV. THESE ARE CALLED POPULATION PARAMETERS, DIFFERENCE IS DIVISION BY N, NOT N-1
P.27 OF YOUR TEXT - FOCUS ON THE MEANING A GUIDELINE ABOUT UNDERSTANDING, BUT NOT A STRICT RULE, ALWAYS LOOK FIRST

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Purpose of the Variance and SD In this lecture, we are introduced to the sample variance and the sample standard deviation to help us estimate the uncertainty associated with a sample statistic. In later chapters we will also use these to measure how close our sample mean is to the population mean.
RECALL - LECTURE 1 - STATISTICIANS SAMPLE NUMBERS GENERATED FROM SAMPLES ARE CALLED STATISTICS POPULATION SAMPLE (A SUBSET OF THE POPULATION) SAMPLE IS USED TO MAKE A STATEMENT ABOUT THE POPUATION

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SAMPLES ARE DRAWN FROM POPULATIONS STATISTICS PARAMETERS WE USE STATISTICS TO MAKE INFERENCES ABOUT POPULATIONS
The Box plot A graphical data summary which uses 5 statistics to describe a distribution and can identify extreme values.

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CAN BE VERTICAL OR HORIZONTAL BEST USE: GROUP COMPARISONS AND OUTLIER DISPLAY
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