find Z test statistic

Statistics
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Assume that you plan to use a significance level of α = 0.05 to test the claim that p1 = p2.  Use the given sample sizes and numbers of successes to find the z test statistic for the hypothesis test.

 A random sampling of sixty pitchers from the National League and fifty-two pitchers from the American League showed that 15 National and 10 American League pitchers had E.R.A's below 3.5.  

Jul 29th, 2015

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Difference = p (1) - p (2) 
Estimate for difference: -0.00356125 
95% CI for difference: (-0.0713370, 0.0642145) 
Test for difference = 0 (vs not = 0): Z = -0.10 P-Value = 0.918

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Jul 29th, 2015

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Jul 29th, 2015
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Jul 29th, 2015
Dec 3rd, 2016
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