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### Socialstat 3

Course: SOCI 120-601, Spring 2012
School: UPenn
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Word Count: 328

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4/18/12 Stastically Socialstat significant the results are representative of the population Significance testing if the probability is small that the difference in the sample occurred by chance ( which means the probability is high that the diff. occurred because there is a diff. in the population) then our results are statistically significant if the probability is low that the difference in the sample occurred...

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4/18/12 Stastically Socialstat significant the results are representative of the population Significance testing if the probability is small that the difference in the sample occurred by chance ( which means the probability is high that the diff. occurred because there is a diff. in the population) then our results are statistically significant if the probability is low that the difference in the sample occurred by chance ( which means the probability is low that the diff. occurred because there is a diff. in the population) then our results are not statistically significant significance testing hypothesis a statement about the relationship btw 2 variables null hypothesis no relationship between the variables (no difference btw the groups and the pop.) alternative hypothesis there is a relationship between the variables (is a diff. btw groups and pop.) p value the probability that we observed the sample value given that the null hypothesis is true (observed sample value is the result of chance Small value p means that it is not likely that our sample result is due to chance Large p value means that it is likely that our sample result is due to chance we want a small p value where it is not likely our results are due to chance and therefore statistically significant enabling us to generalize to the population compare p-value to an alpha level (alpha level is predetermined) most common alpha level is .05 meaning only 5% of time null hypothesis is false when its rlly true if p-value is smaller than the alpha level, then our results are statistically significant at the alpha level other common alpha levels - .01; .001 if we see a difference in our sample and the results are statistically significant ( p-value is smaller than the alpha level) then we reject the null hypothesis (basically accept the alternative hypothesis) if we see a difference in the sample but the results are not statistically significant ( p-value is larger than the alpha level) then we fail to reject the null hypothesis
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Indian Institute of Technology, Madras - APPLIED ME - AM110
Indian Institute of Technology, Madras - APPLIED ME - AM110
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Indian Institute of Technology, Madras - APPLIED ME - AM110
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Indian Institute of Technology, Madras - APPLIED ME - AM110
Indian Institute of Technology, Madras - APPLIED ME - AM110
Indian Institute of Technology, Madras - APPLIED ME - AM110
Indian Institute of Technology, Madras - APPLIED ME - AM110
Indian Institute of Technology, Madras - APPLIED ME - AM110
Indian Institute of Technology, Madras - APPLIED ME - AM110