Finishing up: Statistics & Developmental designs. Psych 231: Research Methods in Psychology. Remember to turn in the second group project rating sheet in labs this week. Announcements. About populations. Real world ( ‘ truth ’ ). H 0 is correct. H 0 is wrong. Type I error. Reject H 0.
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Psych 231: Research Methods in Psychology
Real world (‘truth’)
H0 is correct
H0 is wrong
Type I error
Fail to Reject H0
Type II error
H0: μA = μB
H0: there is no difference between Grp A and Grp B
significant) or is it just sampling error?
set α-levelStatistics Summary
Difference from chance
Make a decision: reject H0or fail to reject H0
Variance from chance
Can’t just compute a simple difference score since there are more than one difference
A - B, B - C, & A - CAnalysis of Variance
Age 20Developmental designs