The IRS is concerned with improving the accuracy of tax information given by its representatives over the telephone. Pre

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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 questions of a large
number of IRS telephone representatives to determine the proportion
of correct responses.​ Historically, the average proportion of
correct responses has been 70percent.​ 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:
17,15,19,20,18,20, 21, 18, 17, 18, 22, 16, 22, 16,19, 22, 23, 21
, 21, and 16
What are the upper and lower control limits for the
appropriate​ p-chart for the​ IRS? Use z​ =3
The UCLp equals
enter your response here
and the
LCLp equals
enter your response here.
​(Enter your responses rounded to four decimal places. If your
answer for LCLp is​ negative, enter this value as 0.)