Question

A manufacturer of ball pens claims that a certain pen he manufactures has a mean
writing of 200 pages with a S.D. of 20 pages. A purchasing agent selects a sample of
200 pens and puts them for test. The mean writing life of the sample was 180 pages.
Should the purchasing agent reject the manufacturer's claim at 5% level of significance?

Answer 1

Answer:

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Answer 2

Don’t know the answer
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