This preview shows pages 1–5. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
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...
View
Full
Document
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 .
 Spring '08
 Perevalov

Click to edit the document details