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A cellular telephone manufacturer that entered the post-regulation market too quickly with new smart-phone design has excessive customer complaints about failures and consequently requests for

A cellular telephone manufacturer that entered the post-regulation market too quickly with new smart-phone design has excessive customer complaints about failures and consequently requests for replacement. How many cellular phones should the manufacturer's engineer, Jennifer, randomly select from warehouse if she wants to be conservative in her estimation of defects fraction (use p=0.75), to within .01 with 95% confidence?

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