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OpenStudy (pralay_bh):

a machine produced 20 defective article in a bath of 400 after the machine is overhauled it produce 10 defective article in a batch of 300 has the machine been improved? test at 5% level of significance?

jigglypuff314 (jigglypuff314):

Hello @Pralay_bh and Welcome to OpenStudy! Sorry for the late reply, but you might get a faster and better response if you tried asking your question in the Mathematics section instead :) http://openstudy.com/study#/groups/Mathematics

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