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Operation Management-question set 2_answer

A critical dimension of the service quality of a call center is the wait time of a caller to get to a sales representative. Periodically, random samples of 6 (n = 6). customer calls are measured for time. Results from the last eight samples are shown in the following table.

Observation (seconds)

Sample

1

2

3

4

5

6

1

425

408

422

380

410

401

2

440

450

431

447

422

430

3

402

428

419

434

433

425

4

375

406

395

400

380

390

5

408

407

407

435

411

405

6

398

417

450

418

402

425

7

413

445

390

402

407

410

8

395

402

397

408

400

415

  1. Management is willing to use three-sigma limits. Using the factors in Table 5.1, determine upper and lower limits for mean and range charts.
  2. Plot sample means and ranges on their respective control charts. Is the process in control? Clearly explain what each chart shows.

    The seven-person maintenance function at a hospital performs both preventive and corrective maintenance on hundreds of items each month. All the workers are scheduled for 40 hours per week and there are four weeks in a month. It is the goal of the maintenance department to achieve 90% utilization with a mix of three-fifths preventive maintenance and two-fifths corrective maintenance.

  3. How many hours each month are spent performing corrective maintenance if they achieve their 90% utilization and corrective/preventive mix targets?
  4. How many hours each month are spent performing preventive maintenance if they achieve their 90% utilization and corrective/preventive mix targets?

    The figure below shows the call routing process for a customer service call center. Incoming calls are routed to work center B or C depending on the caller’s request. The numbers in parentheses are the times in minutes for each step of the process.


  5. What is the capacity per hour for the A-B-D-E process route? Explain your answer.

  6. What is the capacity per hour for the A-C-D-E process route? Explain your answer.

  7. If 60% of the calls are routed to work center B and 40% are routed to work center C, what is the average capacity per hour for the process?

    A company is setting up an assembly line to produce 120 units per hour. The table below identifies the work elements, times, and immediate predecessors.

    Work Element

    Time (Sec.)

    Immediate Predecessor(s)

    A

    21

    B

    20

    A

    C

    25

    A

    D

    20

    B

    E

    10

    B

    F

    15

    C

    G

    10

    C

    H

    12

    D,E

    I

    12

    F,G

    J

    20

    H,I

  8. What cycle time is required to satisfy the required output?

  9. What is the theoretical minimum number of stations?

  10. Use one of the heuristic decision rules to balance the assembly line so that it will produce 120 units per hour.

  11. What is the efficiency of the line you found in part c?

    Observed monthly sales of a popular brand tennis shoe at a medium-sized sports store at the town’s mall over the first six months of the year are given in the following table.

    Month

    Jan

    Feb

    Mar

    Apr

    May

    June

    July

    Aug

    Demand

    26

    30

    33

    45

    36

    40

    38

    42

  12. Use a three-month moving average method to forecast the sales for the months April through September. Also compute the mean squared error (MSE) based on the sales and forecasts for months April through August.

  13. If the forecast for January was 25, determine the forecast for sales for the months February through September using an exponential smoothing method with = 0.60. Also compute the mean squared error (MSE) based on the sales and forecasts for months April through August.

    Which method would you recommend based on MSE? Why?

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