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Two-sample test for independent proportions - using R

Two-sample test for independent proportions


The application prop.test in R outputs the chi square statistic as the test statistic along with the confidence interval for the difference. The data should be provided as a matrix with 2 columns giving the counts of successes and failures, respectively.

Gives something like this:

 2-sample test for equality of proportions without continuity
        correction

data:  tab1
X-squared = 6.1026, df = 1, p-value = 0.01350
alternative hypothesis: two.sided
95 percent confidence interval:
 0.03074072 0.23838896
sample estimates:
   prop 1    prop 2
0.4392523 0.3046875