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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?

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    $\begingroup$ Express data as proportions (eg 0.025 for the first entry) and apply any type of 2-group test. Not sure what the problem is here... $\endgroup$ – katya Aug 16 '15 at 17:58
  • $\begingroup$ Hi Katya. I want to compare all of Q1 to Q2 with 2-proportion Z-Test. What is the collective sample size for Q1 and Q2? $\endgroup$ – Harper Aug 17 '15 at 11:55
  • $\begingroup$ Is the answer to simply calculate weighted average? $\endgroup$ – Harper Aug 19 '15 at 11:25

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