Changes in the method used to coat the tablets in Problem lowered the percentage of reject...

Changes in the method used to coat the tablets in Problem lowered the percentage of rejects from 5.6% to 2.0%. How many tablets should be taken for inspection if the permissible relative standard deviation in the measurement is to be

(a) 20%?

(b) 12%?

(c) 7%?

(d) 2%?

Problem A coating that weighs at least 3.00 mg is needed to impart adequate shelf life to a pharmaceutical tablet. A random sampling of 250 tablets revealed that 14 failed to meet this requirement.

(a) Use this information to estimate the relative standard deviation for the measurement.

(b) What is the 95% confidence interval for the number of unsatisfactory tablets.

(c) Assuming that the fraction of rejects remains unchanged, how many tablets should be taken to ensure a relative standard deviation of 5% in the measurement?