Answer please(part b only)

A 2 Week, 6 operators preliminary Work Sampling study is made of an assembly operation. The Work Elements and the results are shown in the table below. The desired interval for each of the elements are also shown. Element desired interval (1) number of observations 31 8 0.04 1. Assembling components 2 Setup 3. Waiting for material 4. Painting 5. Inspection 0.03 0.02 6 2. 0.02 3 0.02 a. For a 90% confidence interval, determine the number of observations required for the complete study. b. As a Methods Improvement, the company is considering reducing the Waiting Time by 50%, by the installation of a new material handling system, based on the preliminary study data, estimate the annual cost savings. Workers are paid $18 per hour. Consider 40 hours work week, and a 50 weeks work per year. C. Considering the complete work sampling study, the productive elements amounted to 83% of the total time. The complete study of 25 weeks and the observation of a crew of six. Given PF&D of 20%, and a performance rating of 95%, find the standard time per part, if 580 assemblies were completed during the study. A 2 Week, 6 operators preliminary Work Sampling study is made of an assembly operation. The Work Elements and the results are shown in the table below. The desired interval for each of the elements are also shown. Element desired interval (1) number of observations 31 8 0.04 1. Assembling components 2 Setup 3. Waiting for material 4. Painting 5. Inspection 0.03 0.02 6 2. 0.02 3 0.02 a. For a 90% confidence interval, determine the number of observations required for the complete study. b. As a Methods Improvement, the company is considering reducing the Waiting Time by 50%, by the installation of a new material handling system, based on the preliminary study data, estimate the annual cost savings. Workers are paid $18 per hour. Consider 40 hours work week, and a 50 weeks work per year. C. Considering the complete work sampling study, the productive elements amounted to 83% of the total time. The complete study of 25 weeks and the observation of a crew of six. Given PF&D of 20%, and a performance rating of 95%, find the standard time per part, if 580 assemblies were completed during the study