Answer to Question #30778 in Finance for nadhiya

Question #30778
Two research workers classified some people in income groups on the basis
of sampling studies. Their results are as follow:
Investigators Income groups Total
Poor Middle Rich
A 160 30 10 200
B 140 120 40 300
Total 300 150 50 500
Show that the sampling technique of atleast one research worker is defective
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