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August 15th, 2015, 08:45 PM  #1 
Member Joined: May 2015 From: USA Posts: 33 Thanks: 1  2Proportion ZTest 
August 17th, 2015, 04:03 AM  #2 
Member Joined: May 2015 From: USA Posts: 33 Thanks: 1 
Can anyone help with my question? Thanks..

August 17th, 2015, 10:20 AM  #3  
Senior Member Joined: Feb 2010 Posts: 643 Thanks: 111  Quote:
$\displaystyle p_1 = \dfrac{100+120+105}{4000+4050+4100} = \dfrac{325}{12150} \approx 0.0267 $  
August 19th, 2015, 03:26 AM  #4 
Member Joined: May 2015 From: USA Posts: 33 Thanks: 1  
August 19th, 2015, 07:54 PM  #5 
Member Joined: May 2015 From: USA Posts: 33 Thanks: 1  

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