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SOAN 2120 (390)
Lecture

October 4.docx

5 Pages
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Department
Sociology and Anthropology
Course Code
SOAN 2120
Professor
David Walters

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Walters S O A N 2 1 2 0 Walters I n t r o d u c t o r y R e s e a r c h M e t h o d sS O A N 2 1 2 0 I n t r o d u c t o r y R e s e a r c h M e t h o d sLecture Hypothesis Testing and Review Lecture Hypothesis Testing and Review Hypothesis Significance Tests Test claims about a population Hypothesis Significance Tests Test if the mean of the population Test claims about a population is a specified value Test if the mean of the population Test for the difference between is a specified value two valuesTest for the difference between Tests are based on the sampling two valuesdistribution Tests are based on the sampling zscores distribution zscores October 4 2012Hypothesis Testing and Review Hypothesis Significance Teststest claims about a population How it works o test if the mean of the population is a specified value o test for the difference between two values 1State the null hypothesis In a rather counterintuitive How it workstests are based on the sampling distribution zscoresway we are testing the null hypothesis in this case 1State the null hypothesis In a rather counterintuitivethe hypothesis that there is no difference How it works way we are testing the null hypothesis in this case 1 state the null hypothesis H 0 the hypothesis that there is no difference 0a counterintuitivetesting that there is no difference H 0 0bh hypothesis 0 nullthe 0 hypothesisMu equals 2State the alternative hypothesis In this case the 0 2 state the alternative hypothesis the alternative hypothesis is that there is a alternative hypothesis is that there is a difference 2State the alternative hypothesis In this case the difference alternative hypothesis is that there is a difference H 0aaeg mu does not equal 0 H 0 aThe logic of the alternative hypothesisunlike the null hypothesis the alternative hypothesis Research hypothesis simply specifies that our valueis different from mu o we cannot test the alternative hypothesis directly o instead we look for evidence against the null hypothesis o if we find significant evidence against the null hypothesis we can reject it in favour of the alternative hypothesis TwoSided Significance Testswe dont have a theory about a specific direction o if we dont know in which direction to expect the difference we specify a twosided test o testing our value is no equal to could be greater or could be lessExampleassume that someone tells you that the average IQ of university students is 1 1 113you want to know whether the average IQ at Guelph is different from 113randomly select 100 students o write an IQ tests o record scores Null vs Alternative Hypothesisif there is no difference between the IQ of students at Guelph and the IQ of university students in general then mu133This is the null hypothesis
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