Astatistician is testing the null hypothesis that exactly half of all engineers will still be in the profession 10 years after receiving their bachelor's. she took a random sample of 200 graduates from the class of 1979 and determined their occupations in 1989. she found that 111 persons were still employed primarily as engineers. (a) construct a 95% confidence interval estimate for the proportion of engineers remaining in the profession. (ignore the continuity correction and use the formulas on p. 314.)

lower limit =

upper limit =

(b) at the 5% significance level, should the statistician accept or reject her hypothesis?

reject h0accept h0