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# 30 Suppose that, in a survey of 600 employers, 126 indicate that they have used a recruitment service within the past two months to find new staff.

8.30 Suppose that, in a survey of 600 employers, 126 indicate that

they have used a recruitment service within the past two

months to find new staff.

a. Construct a 95% confidence interval for the population

proportion of employers who have used a recruitment

service within the past two months to find new staff.

b. Construct a 99% confidence interval for the population

proportion of employers who have used a recruitment

service within the past two months to find new staff.

c. Interpret the intervals in (a) and (b).

d. Discuss the effect on the confidence interval estimate when

you change the level of confidence.