My Math Forum 2-Proportion Z-Test

 August 15th, 2015, 09:45 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, 05:03 AM #2 Member   Joined: May 2015 From: USA Posts: 34 Thanks: 1 Can anyone help with my question? Thanks..
August 17th, 2015, 11:20 AM   #3
Senior Member

Joined: Feb 2010

Posts: 697
Thanks: 135

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, 04:26 AM   #4
Member

Joined: May 2015
From: USA

Posts: 34
Thanks: 1

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, 08:54 PM   #5
Member

Joined: May 2015
From: USA

Posts: 34
Thanks: 1

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)

 Tags 2proportion, ztest

 Thread Tools Display Modes Linear Mode

 Similar Threads Thread Thread Starter Forum Replies Last Post Aman Verma Algebra 3 January 7th, 2014 04:54 PM haftakhan Algebra 2 July 5th, 2010 02:49 PM Mahonroy Advanced Statistics 2 September 8th, 2009 09:39 AM Aeroplay Number Theory 11 July 28th, 2009 03:59 PM logical Elementary Math 1 June 24th, 2009 11:49 PM

 Contact - Home - Forums - Cryptocurrency Forum - Top