PSYC 3000 Lecture 9: 3000 oct 8

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2 Aug 2016
Department
Course
3000 PSYC
Oct 8
Stating results
-pop mean, sample means. T(df) = tvalue, pvalue, 2tailed/one tailed.
-Must say what test was done, if it is significant and what direction the statistic went. (higher or
lower)
-sentence needs to be somewhat short
-if you are using a test its because your sample is smaller than 30. This means you need to prove
your population is normally distributed in order to run these tests. This means you need to do a
test of the skew or test of kurtosis.
-these tests are done before t test and z test
-this will be done in assignment 2
Test of skew
-(observed skew – expected skew)/standard error of the skew
-formula of standard error of the skew is squared 6 over sample size.
-this then gives you a z value which you need to turn into p value.
Testing kurtosis
-(observed kurt – expected kurt)/standard error of the kurt
-formula of standard error of kurt is squared 24 over sample size.
T test
-2 sample t test are generated when you have two samples that are measured on same variable
but are distinct because one was subject to an independent variable while the other one was not
(control group vs experimental)
Independent samples t test
-testing hypothesis that both samples come from same population
-properties of the population should be the same for both samples
-
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