Class Notes (809,270)
SOAN 2120 (389)
Lecture

September 27.docx

3 Pages
74 Views

School
University of Guelph
Department
Sociology and Anthropology
Course
SOAN 2120
Professor
David Walters
Semester
Fall

Description
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 - every observation can be converted to a z-score - z-scores can indicate whether an observation is statistically significantly different from the mean - z-scores can be positive or negative How it Works - a z-score tells us how many standard deviations an observation is from the mean General Rules - 95% of all observations will be within approximately + or – 2 standard deviations of the mean - 99% of all observation will be within approximately + or – 2.6 standard deviations of the mean - Thus,
More Less

Related notes for SOAN 2120

OR

Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Join to view

OR

By registering, I agree to the Terms and Privacy Policies
Just a few more details

So we can recommend you notes for your school.