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Lecture

School

University of GuelphDepartment

Sociology and AnthropologyCourse Code

SOAN 2120Professor

David WaltersThis

**preview**shows half of the first page. to view the full**3 pages of the document.**September 27, 2012

Population – parameters – the entire group we are interested in

Sample – statistics – a portion of the population

Central tendency – mean, median mode

Mean – average

Median – middle number

Mode – most occurring

– add

X – use value from data set

I – which value to start with

N – number of values in your data set

Measures of variability - range, deviation, variance, standard deviation

Range = highest value – lowest value

Deviation – how far a measurement is form the mean/average of the set

- X minus the mean

Variance - to find sample variance – sum of the squared of deviations divided by n

minus 1 from the number of values in a set

Standard deviation –

Relative standing = z-score

Take ‘x’ substract mean and divide by standard deviation

POPULATION formula:

SAMPLE formula:

“s” is the standard deviation

the “x” is where you plug in the obersavtion

number… which is the number you see in the data set

the x with line over top is the mean

**NOTE THIS: population and sample formula are really the same. You still plug

everything in the same way.**

outlier – just get rid of it… it’s that number that’s way off from the rest of the data

set

Understanding z-scores

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