testing for two proportionsone hundred draws are, Basic Statistics

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testing for two proportionsone hundred draws are

Testing for two Proportions.

One hundred draws are made at random with replacement from box A, and 250 are made at random with replacement from box B.
a) 50 of the draws from box A are positive, compared to 131 from box B: 50.0% versus 52.4%. Is this difference real, or due to chance?
b) The draws from box A average 1.4 and their SD is 15.3; the draws from box B average 6.3 and their SD is 16.1. Is the difference between the averages statistically significant?

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