[A, SfS] Chapter 5: Confidence Intervals: 5.6: CI for difference in proportions
Confidence Interval for the Difference Between Two Population Proportions
In a test of the effect of dampness on electric connections, #100# electric connections were tested under damp conditions and #150# were tested under dry conditions. Twenty of the damp connections failed and only #10# of the dry ones failed.
Compute the margin of error of a #90\%# confidence interval for the difference between the proportions of connections that fail when damp as opposed to dry. Use #3# decimal places.
Margin of error #=#
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