1. (20 points) Data from a 10-hour work sampling study were 30 assemblies were completed are shown below. Assume an overall allowance of 15% to the total working day. a) What is the limit of accuracy of this study for working time using an a = 12%? b) Determine the standard time for one assembly c) The manager says that the range in part a) is unacceptably large. She would like to narrow the range down to #6 minutes of working time. How many observations should you collect to achieve this? Element # of Average observations rating (%) Assemble 240 90 Inspect 56 95 Service 78 125 & rework Idle 26 ANSWERS: a) b) c) 1. (20 points) Data from a 10-hour work sampling study were 30 assemblies were completed are shown below. Assume an overall allowance of 15% to the total working day. a) What is the limit of accuracy of this study for working time using an a = 12%? b) Determine the standard time for one assembly c) The manager says that the range in part a) is unacceptably large. She would like to narrow the range down to #6 minutes of working time. How many observations should you collect to achieve this? Element # of Average observations rating (%) Assemble 240 90 Inspect 56 95 Service 78 125 & rework Idle 26 ANSWERS: a) b) c)