Show sampling technique of at least one of investigators is suspected

Posted on 2014-04-25 07:50:00 in Statistics by FRANK

Two investigators study the income of a group of persons by the method of sampling. Following results were obtained by them:

Investigator	Poor	Middle class	Well to do class	Total
A B Total	160 140 300	30 120 150	10 40 50	200 300 500

Show that the sampling technique of at least one of the investigators is suspected.

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