Chapter 10

# 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.
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
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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