# Sampling distribution of a difference between two independent sample proportions

My apologies that this doesn't fit the template.

Example 10-3 on https://docs.google.com/viewer?a=v&...GYwdS&sig=AHIEtbS9MYMMYAD7Pc1dAVVqY3Q00V4Kyg" of Lloyd Jaisingh's ''Statistics for the Utterly Confused'' says "the probability that the difference in the proportion of success ... is at least 10 percent is 0.2877."

I think 10% never enters the question, and 0.2877 is the probability that the difference is at least 30% (from 0.7-0.4). Is the text in error, or am I?

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