Department of Management

The proportion of defective microcomputer disks is believed to be anywhere from 5% to 10%. The manufacturer will draw a large random sample to estimate the proportion of defective disks.

Department of Management

1. The manufacturer wishes to control the standard deviation of the estimator at 0.03 or less. The sample size is best described as (a)50to90 (b)45to95 (c)55to200 (d)64to125 (e)53to100
2. Ifthemanufacturerknowsthat6%ofdisksaredefectiveandthemanufacturerstillwishestocontrolthestandarddeviationoftheestimatorat0.03orless.Thesmallestsamplesizeisclosestto(a)45(b)50(c)55(d)63(e)100
3. If the manufacturer knows that 6% of disks are defective and they select a sample of 400 disks, the probability that over 7% in the sample are defective is closest to (a) 0.1587 (b) 0.2005 (c) 0.25 (d) 0.2995 (e) 0.3922