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- A business analyst wants to validate a standard time for an existing process of a work operation. A previous study conducted have the following information: Standard Deviation - 30 seconds; Average time – 300 seconds With the desired confidence level of 90% and maximum error of 5%, how many observations should the business analyst conduct? Note: Round-up your answer to whole number. Confidence Level Standard Deviation 80% 1.282 90% 1.645 95% 1.960 99% 2.576A time study has revealed an average observed timeof 5 minutes, with a standard deviation of 1.25 minu tes. Thesefigures are based on a sample of 75 cycles. Is this sample largeenough for analyst Anand Paul to be 99.73% confident that thestandard time is within 5% of the true value?A Methods and Measurements Analyst needs to develop a time standard for a certain task. The task involves use of a ruler, square, and portable electric saw to mark and cut the "notch" in a rafter (a standard carpentry task of home construction). In a preliminary study, he observed one of his workers performing this task five times. The observations were made in an air-conditioned, well-lit training facility, at ground level, with all tools and equipment clean and readily available. Observation: 1 2 3 4 5 Task time (seconds): 82 74 80 88 76 (a) What is the actual average time for this task? (b) What is the normal time for this task if the employee worked at a 10% faster pace than is typical for adequately trained workers? (c) What is standard time for this task if allowances sum to 12%? (d) If the analyst then thought more carefully about his experiment and decided that the allowances needed to be increased to match the real (outside, not…
- The “worker” in this scenario had to perform a candy-sorting task and the rest of the class had to record the observed times (OT) for the task. It was decided that the rating for the “worker” was 100%. Given the following table, find the standard time for each element. Write your answers in order from Element #1 --> Element #5. Answers must have one decimal place: e.g. 3.0 or 12.5. Round up if necessary. Assume a total allowance of 5%. In your equation you will use for ST, consider allowance to be 0.05. Element Trail 1 Trial 2 Standard Time 1 Walk to podium 3 sec 3 sec 2 Fill mug 5 sec 6 sec 3 Walk to desk/sit 5 sec 4 sec 4 Sort Candy 12 sec 12 sec 5 Walk to desk 4 sec 4 secThe “worker” in this scenario had to perform a candy-sorting task and the rest of the class hadto record the observed times (OT) for the task. It was decided that the rating for the “worker” was 100%. Given the following table, find the Normal Time for each element. Write your answers in order from Element #1 --> Element #5. Answers must have one decimal place: e.g. 3.0 or 12.5 Element Trail 1 Trial 2 Normal Time 1 Walk to podium 3 sec 3 sec 2 Fill mug 5 sec 6 sec 3 Walk to desk/sit 5 sec 4 sec 4 Sort Candy 12 sec 12 sec 5 Walk to desk 4 sec 4 secAn analyst has been asked to prepare an estimate of the proportion of time that a turret lathe operator spends adjusting the machine, with 90% confidence level. Based on previous experience, the analyst believes the proportion will be approximately 30%. a. If the analyst uses sample size of 400 observations, what is the maximum error that will be associated with the estimate? b. What sample size would the analyst need in order to have the maximum error be no more than +/- 5%?
- The results of a time study to perform a quality control test are shown in the following table: *Disregard employee is smoking a cigarette (included in personal time). The allowance factor is given to be 25%. a) The normal time for the complete operation = b) The standard time for this process = Performance Observation (minutes per cycle) Element Rating 1 2 3 4 5 1 95% 1.5 1.8 23 2 110% 0.8 0.5 90% 0.5 0.4 4 85% 0.6 0.9 8549 1.8 1.9 1.4 0.6 3.7* 0.6 0.6 0.4 0.4 0.7 0.7 0.7 minutes (round your response to two decimal places). minutes (round your response to two decimal places).Claudine Soosay recorded the following times assembling a watch: Observation No. 1 2 3 4 5 6 7 8 Performance rating is given as 95%. a) The average time of Claudine for the operation = Time (minutes) 0.11 0.09 0.11 0.09 0.15 0.10 0.09 0.10 Observation No. 9 10 11 12 13 14 15 16 minutes (round your response to three decimal places). Time (minutes) 0.11 0.09 0.11 0.10 0.11 0.12 0.14 0.10From a time study, the worker’s average observed time for a particular task is shown to be 5.6 minutes. The analyst feels the worker was performing their task, on average, about 25% faster than normal. What would be the resulting standard time assuming a 20% allowance for fatigue and personal needs?
- Supervisor Kenneth Peterson wants to determinethe percent of time a machine in his area is idle. He decides touse work sampling, and his initial estimate is that the machine isidle 20% of the time. How many observations should Petersontake to be 98% confident that the results will be less than 5% fromthe true results?A time study in a manufacturing company of air conditioners showed the following results for the four basic elements of the production process. With the information presented in the table below: hat is the observed time for the whole operation? 00000 48.5 45.5 51.3 47.9 50.6 Elements B C D Rating Factor (%) 95 100 110 105 2 5 Observations (minutes) 4 2 3 3 12 11 13 15 21 23 18 14 8 6 12 7 5 3 9 6 7 4 4 2 12 21 23 8 6 8 23 10 19 4 10 12 13 10 5 14 29 12 23 15 12 8A worker-machine operation was found to involve 3.3 minutes of machine time per cycle in the course of 40 cycles of stopwatch study. The worker's time-averaged 1.9 minutes per cycle, and the worker was given a rating of 120% (machine rating is 100%). Midway through the study, the worker took a 10-minute rest break. Assuming an allowance factor of 12% of work time, determine the standard time for this job. Hints: you should consider both machine time and machine time together. Also, Allowance only applies to the man, not a machine.