Test and CI for Two Proportions(adsbygoogle = window.adsbygoogle || []).push({});

Sample X N Sample p

1 3 839 0.003576

2 20 1662 0.012034

Difference = p (1) - p (2)

Estimate for difference: -0.00845801

95% upper bound for difference: -0.00290435

Test for difference = 0 (vs < 0): Z = -2.51 P-Value = 0.006

Fisher's exact test: P-Value = 0.025

Cannot understand how the value for upperbound and z, p value were obtained....Fisher's exact test value too? Was checking answer for a problem...and this is given with no explanatations...could anyone please ellaborate? am trying meanwhile

Thanks

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Test for proportions

**Physics Forums | Science Articles, Homework Help, Discussion**