Review practice:Chapter 15§A work sampling study was performed during a three-hour finalexam to determine the proportion of time that students spend usinga calculator. There were 70 students taking the exam. A total of fiveobservations were taken of each student at random times duringthe three hours. Of the total observations taken, 77 of theobservations found the students using their calculators.§(a) Form a 90% confidence interval on the proportion of timestudents spend using their calculators during an exam.§(b) How many observations must be taken for the analyst to be95% confident that the estimate of proportion of time a studentuses a calculator is within ±.03 of the true proportion?2

Get answer to your question and much more

§The Chief IE in the production department wanted to know what value of PFD allowance to use for aparticular section of the shop. A work sampling study was authorized. Only three activity categories wereconsidered: (1) production work, (2) personal time, rest breaks, and delays, and (3) other activities. Over afour-week period (40 hours/week), 100 observations were made at random times. Each observationcaptured the category of activity of each of 22 production workers in the department. Results indicated thatcategory 2 constituted 19% of the total observations.§(a) Define the limits of a 95% confidence interval for activity 2.§(b) If a total of 522 work units were produced during the 4 weeks, and the 1540 observations in category 1activity were all devoted to producing these units, what was the average time spent on each unit?2

Get answer to your question and much more

(b) GivenQ= 522 work units

Get answer to your question and much more