first of all , hello everyone(adsbygoogle = window.adsbygoogle || []).push({});

you can see who i am depending on my nickname ,

but

i need your help

i have one question :

" Three factory creates the same item ,

from the first factory is selected 250 item and 10 of them is defective

from the second factory 200 and 9 of them is defective

from the third 150 and 11 of them is defective

a=0.1 ( Alpha = 0.1 )

question is : test hypothesis about equality of these "selections" ( i don`t know how to say exactly ) "

should i test the first two of them using " Two-proportion z-test " and then test one of them and third using again " Two-proportion z-test " .......... ?

anyone ?

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# Equality of three (selective)

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