B) Is the tax information process in statistical control?

Since there is ______(no data points outside/at least one proportion defective below the lower control limit/at least one data point above the upper/at least one proportion defective), the process is considered to be _____(in/ out) of statistical control.

The IRS is concerned with improving the accuracy of tax information given by its representatives over the telephone. Previous studies involved asking a set of 25 responses has been 70 percent. Recently, IRS representatives have been receiving more training. On April 26 , the set of 25 tax questions were again asked of 20 randomly selected IRS telephone representatives. The proportions of correct answers were: 20,19,19,16,15,15,21,15,17,15,23,9,24,21,19,16,23,16,21,and15. a. What are the upper and lower control limits for the appropriate p-chart for the IRS ? Use z=3. The UCLp equals and the LCLp equals (Enter your responses rounded to four decimal places. If your answer for LCLp is negative, enter this value as 0 .)