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Lecture

SOAN 2120 Lecture Notes - Type I And Type Ii Errors, Statistical Hypothesis Testing, Statistical Inference


Department
Sociology and Anthropology
Course Code
SOAN 2120
Professor
David Walters

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October 16, 2012 SOAN 2120
Chapter 6,7,9 BUT you have to read chapter 4 and 10 for research project
November 8 review class revenge
Hypothesis as a Decision Making Problem
- there are four possible outcomes when we conduct a hypothesis test
- if H0 is not correct, we reject it, we have made the correct decision
- If the null H0 is correct and we accept it, we have made the correct decision
- If the H0 is correct and we reject is, we have made the wrong decision (we
call this type I error)
- The H0 is not correct and we accept it, we have made the wrong decision (we
call this type II error)
when you go from 99% to 95%, it’s easier to reject the null but the probability of
making an error increases as well.
ADVICE: understand the relationship between confidence levels and error types.
FINAL PROJECT: identify an issue, write a short research article, using real data pick
3 variables and examine the relationship b/w them (using SPSS)
2
Type I and Type II Errors
Type I and Type II Errors
Not Guilty Guilty
Truth about Crime
Decision
By
Jury
Guilty
Not
Guilty
Up until now
!
Logic of statistical inference
Probability statements (p-values)
!
Applied Statistics
Criminologist – does a public policy
influence crime rates
Medical researcher – does this particular
drug reduce depressive symptoms
Sociologist – how is gender related to
labour market rewards
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