Please answer question # 14

male the mean time for element 2 within I percent of its true value with a 95.5 percent confidence? c. How many observations would be needed to estimate the mean time for element 2 within .01 minute of its true value with a 95,5 percent confidence? OBSERVATIONS (minutes per cycle) Pero tance Rating Element 1 2 time 3 4 5 6 1 190% 1.20 1.17 1.16 1.22 1.24 1.15 2 115 0.83 0.87 0.78 0.82 0.85 1.32 0.58 0.53 0.52 3 105 "Unusual delay, drome 0.59 0.60 0.54 to lift lightly 11. How many observations should a time study analyst plan for in an operation that has a standard deviation of 1.5 minutes per piece if the goal is to estimate the mean time per piece to within 4 minute with a confidence of 95.5 percent? 12. How many work cycles should be timed to estimate the average cycle time to within 2 percent of the sample mean with a confidence of 99 percent if a pilot study yielded these times (minutes): 5.2, 5.5, 5.8, 5.3.5.5, and 5.1? The standard deviation is .253 minutes per cycle. 13. In an initial survey designed to estimate the percentage of time air-express cargo loaders are idle. an analyst found that loaders were idle in 6 of the 50 observations. a. What is the estimated percentage of idle time? b. Based on the initial results, approximately how many observations would you require to esti- mate the actual percentage of idle time to within 5 percent with a confidence of 95 percent? 14. An analyst made the following observations about whether customer service representatives were busy (B) or idle (1): a. What is the percentage of idle time? b. Given these results, how many observations would be needed to estimate the actual percentage of idle time to within 6 percent with a confidence of 90 percent? ony for of the nd the f work male the mean time for element 2 within I percent of its true value with a 95.5 percent confidence? c. How many observations would be needed to estimate the mean time for element 2 within .01 minute of its true value with a 95,5 percent confidence? OBSERVATIONS (minutes per cycle) Pero tance Rating Element 1 2 time 3 4 5 6 1 190% 1.20 1.17 1.16 1.22 1.24 1.15 2 115 0.83 0.87 0.78 0.82 0.85 1.32 0.58 0.53 0.52 3 105 "Unusual delay, drome 0.59 0.60 0.54 to lift lightly 11. How many observations should a time study analyst plan for in an operation that has a standard deviation of 1.5 minutes per piece if the goal is to estimate the mean time per piece to within 4 minute with a confidence of 95.5 percent? 12. How many work cycles should be timed to estimate the average cycle time to within 2 percent of the sample mean with a confidence of 99 percent if a pilot study yielded these times (minutes): 5.2, 5.5, 5.8, 5.3.5.5, and 5.1? The standard deviation is .253 minutes per cycle. 13. In an initial survey designed to estimate the percentage of time air-express cargo loaders are idle. an analyst found that loaders were idle in 6 of the 50 observations. a. What is the estimated percentage of idle time? b. Based on the initial results, approximately how many observations would you require to esti- mate the actual percentage of idle time to within 5 percent with a confidence of 95 percent? 14. An analyst made the following observations about whether customer service representatives were busy (B) or idle (1): a. What is the percentage of idle time? b. Given these results, how many observations would be needed to estimate the actual percentage of idle time to within 6 percent with a confidence of 90 percent? ony for of the nd the f work