Determine the appropriate sample size - process design, Operation Management

The following work sampling data was collected from observing a retail assistant: 

Activity                                                Number of observations

Attending to customers                                  60

Telephone enquiries                                        150

Walking around                                              40

Reading data                                                 30

Talking to manager                                         40 

Talking to other workers                                 20 

Lunch/coffee/comfort breaks                          50 

Dealing with customer complaints                  110 

Total                                                          500

The figures mean that, say, over the course of a day, it is estimated that 22 per cent of the time was devoted to dealing with customer complaints. 

(a) Determine the limits of accuracy of the above calculation 

(b) If the accuracy needed was to be ±1 per cent, determine the appropriate sample size. 

(c) How would an operations manager use the data obtained from the exercise described?

Answer: (a) N = 4P (100 - P) /L2 

 N = 500 

 P = 22 per cent 

 L = SQRT (4 × 22 (100 - 22))/500) = 3.7 per cent 

Therefore, P = 22 per cent ±3.7 per cent (ie we are 95 per cent confident that the true value lies between 18.3 per cent and 25.7 per cent) 

(b) 88(78)/1 = 6864. Unlikely to be economically worthwhile - a sample size of 1716 would give ±2 per cent accuracy 

(c) For setting targets of improvement, determining areas of improvement, cost savings, staff training.

Posted Date: 3/19/2013 1:23:39 AM | Location : United States







Related Discussions:- Determine the appropriate sample size - process design, Assignment Help, Ask Question on Determine the appropriate sample size - process design, Get Answer, Expert's Help, Determine the appropriate sample size - process design Discussions

Write discussion on Determine the appropriate sample size - process design
Your posts are moderated
Related Questions
Watch the video, How to Perform a SWOT Analysis, and then conduct a SWOT analysis using the Starbucks' Global Quest 2006: Is the Best Yet to Come? case provided in the Course Mater

Which of the following is not a major strategic operational competitive dimension that forms a company's competitive position?

Since May of 2005, the purchase manager at a department store has been using a 4-period moving average to forecast sales in upcoming months. Sales data for the months of January th

John Barks owns Barks Computer Screens Inc. and wants to identify the supply and demand for screens in his market. The company can produce large screens called Wides or small scree

Describe the advantages and disadvantages of the various methods of data collection.

Consider a fast-food restaurant that is trying to improve its service during the 12:00 - 2:00 lunch period.  Right now the restaurant employs 5 different single-channel queues, but

Analyze, compare and contrast the code of ethics of both Starbuck's and McDonald's.

How can the HRM professional be prepared to deal with the variations in HR practices in the global environment

Type your question hereHRIS systems have allowed HR to automate a variety of functions, including performance management, training, employee development, staffing, compensation, an

Order Losers - Operations Strategy These are characteristics which denote poor performance in the operations management function and can cause losses in current or future busi