Contents
 Title page
 Descriptive
vs Inferential statistics
 Inferential
statistics is a leap into the unknown
 Remember
the study of students' drinking habits?
 Your sample's
mean was 10.54
 You found
that other people got different results
 If you could
get enough samples from that population ...
 The Sampling
Distribution of Sample Means
 It has some
useful properties
 The third
useful property
 Estimate
the Standard Error of the Mean
 You use information
about sample statistics to estimates of population parameters
 The key to
inferential statistics is the sampling distribution
 Four important
assuimptions
 The mean
and standard deviation of the sampling distribution
 Standard
errors are measures of sampling variability
 A large standard
error means that ....
 Only two
things influence the standard error
 Standard
errors and level of confidence
 How close
are you? How confident are you?
 You know
four things.
 A picture
showing how 95% of sample means are within +/ 1.96 SEM of the population
mean
 A picture
showing how you can be 95% certain that .....
 The Standard
Error of Proportions
 The Standard
Error of Differences Between Means
 Standard
errors measure sampling variability
 Two things
affect sampling variability
 Blank Slide

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Information: Inferential Statistics
Last updated:
August 6, 2005
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Copyright 2005 William D. Richards
