SPRING 2011 Testing for the difference between two means

# SPRING 2011 Testing - More for Chapter 9 Testing for the difference between two means#8 From your book From the 2008 GSS Data the mean educational

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Unformatted text preview: More for Chapter 9: Testing for the difference between two means: #8 From your book: From the 2008 GSS Data the mean educational attainment for liberals is 13.90 years with a standard deviation of 3.27. The mean education attainment for conservatives is 13.55 years with a standard deviation of 2.82. N for liberals is 187. N for conservatives is 227. Test the research hypothesis H 1 that there is a difference in the level of education between liberals and conservatives, set alpha at 0.01. Null Hypothesis is H :µ 1 =µ 2 There is no difference between the population means for conservatives and liberals. Research Hypothesis is H 1 :µ 1 ≠µ 2 There is a difference between the population means for conservatives and liberals. Calculate a t statistic using the following formula, variances are not different (one is not twice as big as the other). 2 1 2 1 2 1 ) 2 ( Y Y N N S Y Y t − − + − = 1 − 2 = ¡ ( ¢ £ 1) 1 ¤ + ( ¤ £ 1) 2 ¤ (...
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## This note was uploaded on 07/13/2011 for the course SOC 301 taught by Professor Heberle during the Spring '11 term at University of Louisville.

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