The IRS is concerned with improving the accuracy of taxinformation given by its representatives over the telephone.Previous studies involved asking a set of
2525
questions of a large number of IRS telephone representatives todetermine the proportion of correct responses.? Historically, theaverage proportion of correct responses has been
7171
percent.? Recently, IRS representatives have been receiving moretraining. On April? 26, the set of
2525
tax questions were again asked of 20 randomly selected IRStelephone representatives. The proportions of correct answers?were:
1515?,
1616?,
1919?,
1616?,
1515?,
1414?,
2121?,
2121?,
1717?,
2121?,
2323?,
1616?,
2222?,
1515?,
1515?,
2020?,
2323?,
1616?,
2121?,
and
1515.
a. What are the upper and lower control limits for theappropriate? p-chart for the? IRS? Use z? =
33.
The
UCL Subscript pUCLp
equals
nothing
and the
LCL Subscript pLCLp
equals
nothing.
?(Enter your responses rounded to four decimal places. If youranswer for
LCL Subscript pLCLp
is? negative, enter this value as
0.?)
