Questions from Management Science

Q: A company manufactures mechanical heart valves from the heart valves of pigs

A company manufactures mechanical heart valves from the heart valves of pigs. Different heart operations require valves of different sizes. The company purchases pig valves from three different suppli...

Q: Based on Quinn et al. (1991). Winter Riggers handles

Based on Quinn et al. (1991). Winter Riggers handles approximately $400 million in telephone orders per year. Winter Riggers’ system works as follows. Callers are connected to an agent if one is avail...

Q: Little’s formula applies to an entire queueing system or to a subsystem

Little’s formula applies to an entire queueing system or to a subsystem of a larger system. For example, consider a single-server system composed of two subsystems. The first subsystem is the waiting...

Q: Zerox has 16 service centers throughout the United States. Zerox is

Zerox has 16 service centers throughout the United States. Zerox is trying to determine how many technicians it should assign to each service center. How would you approach this problem?

Q: Based on Kolesar et al. (1974), Metropolis PD Precinct

Based on Kolesar et al. (1974), Metropolis PD Precinct 88 must determine the minimum number of police cars required to meet its needs for the next 24 hours. An average call for service requires 30 min...

Q: Consider a bank where potential customers arrive at rate of 60 customers

Consider a bank where potential customers arrive at rate of 60 customers per hour. However, because of limited space, one out of every four arriving customers finds the bank full and leaves immediatel...

Q: Consider a fast-food restaurant where customers enter at a rate

Consider a fast-food restaurant where customers enter at a rate of 75 per hour, and three servers are working. Customers wait in a single line and go, in FCFS fashion, to the first of the three server...

Q: A fast-food restaurant has one drive-through window.

A fast-food restaurant has one drive-through window. On average, 40 customers arrive per hour at the window. It takes an average of one minute to serve a customer. Assume that interarrival and service...

Q: The file contains the monthly number of airline tickets sold by a

The file contains the monthly number of airline tickets sold by a travel agency. a. Does a linear trend appear to fit these data well? If so, estimate and interpret the linear trend model for this ti...

Q: Sometimes curvature in a scatterplot can be fit adequately (especially to

Sometimes curvature in a scatterplot can be fit adequately (especially to the naked eye) by several trend lines. We discussed the exponential trend line, and the power trend line is discussed in the p...