Show your work. 7) A manager of a cafeteria wants to estimate the average time customers wait before

Show your work.

7) A manager of a cafeteria wants to estimate the average time customers wait before being served. A random sample of 49 customers has an average waiting time of 8.4 minutes with a standard deviation of 3.5 minutes.

a) With 90% confidence, what can the manager conclude about the possible size of his error in using 8.4 minutes to estimate the true average waiting time?

b) Find a 90% confidence interval for the true average customer waiting time.

c) With 98% confidence, what can the manager conclude about the possible size of his error in using 8.4 minutes to estimate the true average waiting time?

d) Find a 98% confidence interval for the true average customer waiting time.

 

Looking for a Similar Assignment? Hire our Top Techical Tutors while you enjoy your free time! All papers are written from scratch and are 100% Original. Try us today! Active Discount Code FREE15