Chapter 10 - from applying two different treatments to one...

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Chapter 10 1 Chapter 10 Two Sample Hypothesis Tests
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Chapter 10 2 Two Sample Tests Two sample tests are used when we’ve applied two treatments to two groups. The groups are comprised of different individuals so that the two samples are independent.
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Chapter 10 3 Testing Difference in Two Proportions • H 0 : π 1 = π 2 • H 1 : π 1 π 2, π 1 < π 2, π 1 > π 2 Use 2 1 2 1 2 1 2 1 ) 1 1 ( ) 1 ( n n x x p n n p p p p z + + = + - - =
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Chapter 10 4 Testing Difference in Two Means • H 0 : μ 1 = μ 2 • H 1 : μ 1 μ 2 ( μ 1 < μ 2 ) ( μ 1 > μ 2 ) The t statistic is With degrees of freedom equal to the min(n 1 -1, n 2 -1) t x x s n s n calculated = - + 1 2 1 2 1 2 2 2
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Chapter 10 5 Matched Pairs Procedure Procedure used to compare results
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Unformatted text preview: from applying two different treatments to one sample. • Uses the one-sample t test to test the average difference between observations Chapter 10 6 μ d is the mean of the individual differences. If there is no difference in the results of the two treatments what would you expect μ d to equal? • is the average of the differences in the sample observations. • s d is the standard deviation of the differences d Matched pairs Chapter 10 7 d t d n = s d With n-1 degrees of freedom...
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This note was uploaded on 10/08/2009 for the course BCOR 2200 taught by Professor Tomnelson during the Spring '08 term at Colorado.

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Chapter 10 - from applying two different treatments to one...

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