Exam 24: Measuring Output Rates

A job shop manager wants to determine the proportion of time the workers are idle.The shop employs two types of workers.Type 1 includes three workers and Type 2 includes two workers.The manager suspects that the proportion of idle time is about 20 percent for Type 1 workers and 15 percent for Type 2 workers.If the manager wants a 95 percent confidence level (z = 1.96)and a degree of precision of + 0.05,how many trips will the observers have to take through the group?

What are the limitations of time studies?

As the sample size increases in a work sampling study,the maximum error decreases.

If a worker spends 10 hours per day performing a task,and the allowance for this task is 19 percent,how many hours during the average day is the worker involved in nonproductive activities?

The method used most often for setting time standards for a job is the:

Table H.1 A worker was observed for four cycles in a repetitive task that contains four distinct elements.The observer recorded the following items in seconds,using the continuous method. -Use the information in Table H.1.What is the select time for work element 3?

The ________ is the average observed time based only on representative times.

When using the MTM approach:

A larger sample size is required when the job being studied is shorter in average duration.

An undergraduate business student studies diligently in the library during dead week in anticipation of an outstanding performance on her final exams.She asks a friend to spy on her at random intervals to determine what percentage of time she is actually studying.Over the course of three days,her friend records the following observations: If the student wants a 95 percent confidence level (z = 1.96)and a degree of precision of + 0.08,how many more observations are needed?

Table H.2 -Use the information in Table H.2.Which work element will take the longest for an average worker to perform per cycle?

An industrial engineer is conducting a time study for a work element.The select time is 7.5 minutes,and the sample standard deviation of the observed time is one minute.What is the appropriate sample size if the estimate is to be 3 percent of the true average time 95 percent of the time (z = 1.96)?

Table H.1 A worker was observed for four cycles in a repetitive task that contains four distinct elements.The observer recorded the following items in seconds,using the continuous method. -Use the information in Table H.1.Assume that work element 1 receives a performance rating factor of 1.1 and all other elements receive a rating of 1.2.If work elements 1 and 3 are performed every other cycle,and elements 2 and 4 are performed every cycle,what is the normal time for the complete cycle?

Which of the following is TRUE regarding the MTM approach?

The methods time measurement system is a predetermined data system.

The gentleman farmer recorded the time it took to feed and water his chickens and collect eggs each morning.He has done this several times,so he assigns himself a rating of 1.15.The allowance factor for this endeavor is 5%.What is the standard time for this job element?

The gentleman farmer recorded the time it took to feed and water his chickens and collect eggs each morning.He has done this several times,so he assigns himself a rating of 1.15.The allowance factor for this endeavor is 5%.What is the select time for this job?

Table H.3 A worker was observed for four cycles in a repetitive task.The observer recorded the following times,in seconds,using the continuous method.The ratings for each element and frequency it is performed are also indicated in the table.The allowance fraction is 20 percent. -Use the information in Table H.3.What is the select time for work element 4?

A time study analysis was performed on a task with two work elements.The select times for these work elements are 21.0 seconds and 13.0 seconds,with rating factors of 1.1 and 1.2,respectively.Each work element is performed twice per cycle.If an allowance of 20 percent is used,what is the standard time for this task?

Name the four steps in a time study.