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# Ch10 - Chapter 10 Two Sample Hypothesis Tests Chapter 10 1...

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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 Propo • 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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Example Does Dell’s new design strategy work? A sample of 200 people before the strategy resulted in 90 saying they would buy a Dell. After the strategy, 50 were polled and 30 said they would buy Dell. I want a 5% level of significance. What do you conclude? Chapter 10 4
Example BEFORE (sample 1) AFTER (sample 2) n 1 = 200 n 2 = 50 x 1 = 90 x 2 = 30 p 1 = .45 p 2 = .60 Chapter 10 5 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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Overview Comparing 2 proportions Comparing 2 means Independent samples with unknown variances, assumed unequal (case 3) Paired samples – paired t test Chapter 10 6
Chapter 10 7

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Ch10 - Chapter 10 Two Sample Hypothesis Tests Chapter 10 1...

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