A SERIES OF QUESTIONS TO MEASURE JOB SATISFACTION OF BUS DRIVER\'S IN NEW YORK CITY. A random sample of 100 drivers has an average score of 10.6, with a standard deviation of 2.8. What is your estimate of the average job satisfaction score for the population as a whole? Use the 95 percent confidence level. Solution Given a=0.05, |Z(0.025)|=1.96 (check standard normal table) So 95% CI is xbar±Z*s/n --> 10.6± 1.96*2.8/10 --> (10.0512, 11.1488).

1. A SERIES OF QUESTIONS TO MEASURE JOB SATISFACTION OF BUS DRIVER'S IN
NEW YORK CITY.
A random sample of 100 drivers has an average score of 10.6, with a standard deviation of 2.8.
What is your estimate of the average job satisfaction score for the population as a whole? Use the
95 percent confidence level.
Solution
Given a=0.05, |Z(0.025)|=1.96 (check standard normal table)
So 95% CI is
xbar±Z*s/n
--> 10.6± 1.96*2.8/10
--> (10.0512, 11.1488)