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IEE380Summer09Q9_Solutions

# IEE380Summer09Q9_Solutions - IEE 380 Summer 2009 Quiz#9A...

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IEE 380 Summer 2009 Name: _____________________________ Quiz #9A In a poll of 50 people, 12 said that they would vote for Candidate A over Candidate B in an election. Is there evidence that the proportion of people voting for Candidate A is not .25? Clearly state your conclusion and show all work. Use α = .01. What is the p-value? p-value = 2 Φ (z 0 ) = 2(.436) = .872 ( 29 0 005 . 0 .005 .005 0 0 0 1 0 H reject to fail we z z - Since 58 . 2 z 16 . ) 75 )(. 25 (. 50 ) 25 )(. 50 ( 12 1 25 . : 25 . : z p np np x z p H p H < < = - = - = - - = =

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Name: _____________________________ Quiz #9B In a poll of fifty people, twelve said that they would vote for Bob over all other candidates in an election. Is there evidence that the proportion of people voting for Bob is less than .25? Clearly state your conclusion and show all work. Use α = .01. What is the p-value? Φ (z 0 ) = .436 ( 29 0 0 .01 .01 0 0 0 1 0 H reject to fail we z z - Since 33 . 2 z 16 . ) 75
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IEE380Summer09Q9_Solutions - IEE 380 Summer 2009 Quiz#9A...

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