My Math Forum 2-Proportion Z-Test

 August 15th, 2015, 08:45 PM #1 Member   Joined: May 2015 From: USA Posts: 34 Thanks: 1 2-Proportion Z-Test Hello, I want to compare, with 2-Proportion Z-Test, the number of student visits to school nurse office in Q1 of 2015 to Q2 of 2015. What do I use for sample size for Q1 and Q2 when it’s different each month because of new students or students who drop?
 August 17th, 2015, 04:03 AM #2 Member   Joined: May 2015 From: USA Posts: 34 Thanks: 1 Can anyone help with my question? Thanks..
August 17th, 2015, 10:20 AM   #3
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Quote:
 Originally Posted by Scully Hello, I want to compare, with 2-Proportion Z-Test, the number of student visits to school nurse office in Q1 of 2015 to Q2 of 2015. What do I use for sample size for Q1 and Q2 when it’s different each month because of new students or students who drop?
You might try using a weighted average. Here it is for Q1:

$\displaystyle p_1 = \dfrac{100+120+105}{4000+4050+4100} = \dfrac{325}{12150} \approx 0.0267$

August 19th, 2015, 03:26 AM   #4
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Quote:
 Originally Posted by mrtwhs You might try using a weighted average. Here it is for Q1: $\displaystyle p_1 = \dfrac{100+120+105}{4000+4050+4100} = \dfrac{325}{12150} \approx 0.0267$
Calculating the weighted average makes sense!

August 19th, 2015, 07:54 PM   #5
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Quote:
 Originally Posted by mrtwhs You might try using a weighted average. Here it is for Q1: $\displaystyle p_1 = \dfrac{100+120+105}{4000+4050+4100} = \dfrac{325}{12150} \approx 0.0267$
To calculate the weighted average, is the numerator this?

(4000×100+4050×120+4100×105)

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