| Software Output Summary
data from the previous example
Two-Sample
Difference of Proportions (2-tailed)
School A School B
Sample
Proportion 0.23 0.07
Sample
Size (n) 80 180
Z-statistic
p <
Significance 3.674 0.0002
For a 2-tailed test, the p-value represents the
probability of making a type 1 error (concluding there is statistical significance when
there is none). Since there is far less than a
5% chance of making a type 1 error, you would conclude there is statistical significance.
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