7.2 Objectives The objectives of this laboratory experiment are as follows: To understand the concept and the technique of the work-sampling study method in time measurement. To use the work-sampling study in order to determine the average time of a task. To use the work-sampling study in order to determine the normal and standard times of a task. To understand the implementation of a work-sampling study in the evaluation of various utilisation. workers’ 7.3 Experiment Exercise (First part of the experiment) A work-sampling study was performed on nine workers in the milling production department in a steel factory. The task was divided into four activity categories: on waits for raw ‘worker operates machine’ (producing units), ‘worker talks with advisor and co-workers’, and inspects materials’, ‘worker ‘worker The below table 1 shows the work-sampling data study form that was unit’. used in the study and contained the data collection for the nine workers with randomised time and time of data collection. The factory approved 13% as an allowance factor Apfd. A total of 438 work units were produced during the two weeks. Furthermore, 753 were inspected during the two weeks. 7.4 Results of the Experiment A laboratory exercise report includes the following: Construct a 90% confidence interval for the true proportion of time spent producing units. Construct a 95% confidence interval for the true proportion of time spent inspecting units. Determine the average time per day that each worker spends producing units as well as inspecting unit. Determine the standard time for the operates on ‘worker machine’ category.
7.2 Objectives The objectives of this laboratory experiment are as follows: To understand the concept and the technique of the work-sampling study method in time measurement. To use the work-sampling study in order to determine the average time of a task. To use the work-sampling study in order to determine the normal and standard times of a task. To understand the implementation of a work-sampling study in the evaluation of various workers’ utilisation. 7.3 Experiment Exercise (First part of the experiment) A work-sampling study was performed on nine workers in the milling production department in a steel factory. The task was divided into four activity categories: ‘worker operates on machine’ (producing units), ‘worker waits for raw materials’, ‘worker talks with advisor and co-workers’, and ‘worker inspects unit’. The below table 1 shows the work-sampling data study form that was used in the study and contained the data collection for the nine workers with randomised time and time of data collection. The factory approved 13% as an allowance factor Apfd. A total of 438 work units were produced during the two weeks. Furthermore, 753 were inspected during the two weeks. 7.4 Results of the Experiment A laboratory exercise report includes the following: Construct a 90% confidence interval for the true proportion of time spent producing units. Construct a 95% confidence interval for the true proportion of time spent inspecting units. Determine the average time per day that each worker spends producing units as well as inspecting unit. Determine the standard time for the ‘worker operates on machine’ category.