slide4 - 1 Diff of Means, Var unknown Null hypothesis: Test...

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Unformatted text preview: 1 Diff of Means, Var unknown Null hypothesis: Test statistic: 1 2 : H - = ( 29 ( 29 2 2 2 1 1 2 2 1 2 1 2 1 2 1 1 , 2 1 1 p p n S n S X X T S n n S n n- +--- = =-- + Degrees of freedom 2 2 1 2 = 2 Diff of Means, Var unknown Null hypothesis: Test statistic: 1 2 : H - = ( 29 ( 29 2 2 2 1 2 1 2 1 2 2 2 2 2 2 2 1 2 1 1 2 2 1 2 1 2 , 2 1 1 S S n n X X T S S S n S n n n n n + -- = =- + + + + Degrees of freedom 2 2 1 2 3 M&M Example Bob purchases packets of M&Ms on a regular basis from two locations: Easton and Allentown. He wonders if, on average, he gets the same number of M&Ms in each packet from the Easton store as he does from the Allentown store. Over the next few months, Bob carefully counts the number of M&Ms in each packet he buys. 4 M&M Example cont He finds from the 10 packets he bought from the Easton store that there was an average of 28 M&Ms per packet with a sample standard deviation of 2.45. From the 12 packets he bought from the...
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This note was uploaded on 03/17/2008 for the course IE 121 taught by Professor Perevalov during the Spring '08 term at Lehigh University .

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slide4 - 1 Diff of Means, Var unknown Null hypothesis: Test...

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