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Mr. Alok is a purchasing agent of electronic calculators. He is interested in determining at a...

Mr. Alok is a purchasing agent of electronic calculators. He is interested in determining at a confidence level of 95% what proportion (within plus or minus 4%), is defective. Conservatively, how many calculators should be tested to find the proportion defective? (Hint: If he tests conservatively, then p = .5 and q = .5).

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Answer #1

z at 95% = 1.96

Formula:

Finding Sample Size for Estimating a Popoulation Proportion (1-p) M2 where M is the margin of error

M = 0.04 here

n=\frac{1.96^2*0.5*0.5}{0.04^2}

n = 600

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