A study conducted several years ago reported that 23 percent of
public accountants changed companies within 4 years. The American
Institute of CPAs would like to update the study. They would like
to estimate the population proportion of public accountants who
changed companies within 4 years with a margin of error of 4% and a
90% level of confidence. (Round your
z value to 3 decimals. Round
up your answers to the next whole number.)
a.To update this study, the files of how many public accountants
should be studied?
b.How many public accountants should be contacted if no previous
estimates of the population proportion are available?
