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A machine produced 20 defective articles in a batch of 400. After overhauling, it produced 10% defectives in a batch of 300. Which test of hypothesis can be applied to
the above situation to examine whether the machine has improved ? (2 marks)
Test of significance of a sample proportion (two-tail test)
Test of significance of a sample proportion (one-tail test)
Test of significance of difference between two sample proportion (two-tail test)
Test of significance of difference between two sample proportion (one-tail test)
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