Principles Of Operations Management
11th Edition
ISBN: 9780135173930
Author: RENDER, Barry, HEIZER, Jay, Munson, Chuck
Publisher: Pearson,
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Question
Chapter 10, Problem 18P
a)
Summary Introduction
To determine: Thenormal time for the process.
Introduction: Time study is the basis that helps set the standard time; it would time a sample of the performance of the worker.
b)
Summary Introduction
To determine: Thestandard time for the process.
Introduction: Time study is the basis that helps set the standard time; it would time a sample of the performance of the worker.
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2.A job had an observed time of five minutes, a performance rating of .70, and an allowance factor of 20 percent of job time. Twenty cycles were timed. Standard time for the job in minutes is:
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Chapter 10 Solutions
Principles Of Operations Management
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- After being observed many times, Beverly Demarr, ahospital lab analyst, had an average observed time for blood testsof 12 minutes. Beverly’s performance rating is 105%. The hospitalhas a personal, fatigue, and delay allowance of 16%.a) Find the normal time for this process.b) Find the standard time for this blood test.arrow_forwardA hotel housekeeper, Alison Harvey, was observed five times on each of four task elements, as shown in the following table. On the basis of these observations, find the standa rd timefor the process. Assume a I 0% a llowance factor.arrow_forwardRefer to Problem (If Charlene Brewster has times of 8.4, 8.6, 8.3, 8.5, 8. 7, and 8.5 and a performance rating of I 10%, what is the normal time for this operation? Is she faster or slower than normal?).a) If t he allowance factor is 15%, what is the standard time for this operation?b) If the allowance factor is 18% and the performance rating is now 90%, what is the standard time for this operation?arrow_forward
- Based on a careful work study in the Hofstetter Corp., the results shown in the following table have been observed: a) Compute the normal time for each work element.b) If the allowance for this type of work is 15%, what is the standard time?c) How many observations are needed for a 95% confidence level within ±5% accuracy? (Hint: Calculate the sample size of each element.)arrow_forwardIf the normal time is 1.30 min for a repetitive task that produces one work unit per cycle, and the company uses a PFD allowance factor of 12%, determine (a) the standard time for the task and (b) how many work units are produced in an 8-hour shift at standard performance.arrow_forwardHow many observations should a time study analyst plan for in an operation that has a standard deviation of 1.1 minutes per piece? The goal is to estimate the mean time per piece to within 0.4 minutes, with a confidence of 95.5 percent. (Do not round intermediate calculations. Round up your final answer to the next whole number.).arrow_forward
- Describe when is work sampling a more appropriate work measurement technique than time study ?arrow_forwardSuppose Charlene Brewster has times (in seconds) of 8.3, 8.5, 8.4, 8.4, 8.6, 8.6 and a performance rating of 110%. a) For a given allowance factor of 15%, the standard time for the operation = ? seconds (round your response to two decimal places).arrow_forwardErgonomics problem A work measurement analyst in the Electrical Company took 10 observations (for each element) of an operation job. The operation consists of four elements of work. Result of observation was shown in a Table attached. a. Determine the standard time and standard output if the total allowance time is 12% b. Check whether number of observation is sufficient or not for a 95 percent confidence level and 5 percent significant level.arrow_forward
- Describe some of the limitations of time study method ?arrow_forwardA time study was made of an existing job to develop new time standards. A worker was observed for 45 minutes.During that period, 30 units were produced. The analyst rated the worker as performing at a 90 percent performance rate. Allowances in the firm for rest and personal time are 12 percent. a. What is the normal time for the task?b. What is the standard time for the task?c. If the worker produced 300 units in an eight-hour day, what would be the day’s pay if the basic rate was $6 per hour and the premium payment system paid on a 100 percent basis?arrow_forwardA job in an insurance office involves telephone conversations with policyholders. The office manager estimates that about half of the employee’s time is spent on the telephone. How many observations are needed in a work sampling study to estimate that time percentage to within 6 percent and have a confidence of 98 percent?arrow_forward
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