The proportion of public accountants who have changed compan

The proportion of public accountants who have changed companies within the last three years is to be estimated within 4 percent. The 95 percent level of confidence is to be used. A study conducted several years ago revealed that the percent of public accountants changing companies within three years was 19 (Round up your answers to the next whole number.) To update this study, the files of how many public accountants should be studied? How many public accountats should be contacted if no previous estimates of the population proportion are available?

Solution

a) (z/ME)^2*p(1-p)= (1.96/0.05)^2*.22*.78=263.7 n=264 b)(1.96/0.05)^2*.5*.5=384.2 n=385