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In a study of store checkout scanners, a sample of 1234 items were checked and 20...

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Statistics

In a study of store checkout scanners, a sample of 1234items were checked and 20 of them were overcharges. It had beenclaimed by the manufacturers that only 2% of the sales would beovercharges. Based on these results, at the 1% level ofsignificance, do the scanners appear to overcharge less often thanthe 2%?

(1) List all the information necessary for conductingthe hypothesis test and state which

test you are doing.

(2) State the null and alternative hypotheses andwhether you would use a right-tailed

test, a left-tailed test, or a two-tailedtest.

(3) Sketch the critical reason, indicating on the sketchwhat the critical value(s) are.

(4) Determine the calculated z or t.

(6) Decide if you will Reject or Fail to Reject the NullHypothesis.

(7) Interpret your conclusion in terms of theproblem.

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