Asked by Anonymous

an insurance company estimates 40 percent of its claim have errors. The insurance company wants to estimate with 90 percent confidence the proportion of claims with errors

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Answered by MathGuru
CI90 = p + or - 1.645 [√(pq/n)]
...where p = .40, q = 1 - p, n = sample size.

I'll let you take it from here.


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