2. How many observations should a stopwatch time-study analyst plan for in a task that has a standard deviation of 1.31 minutes per piece if the goal is to estimate the mean time per piece to within 0.2 minute with a confidence of 95.0 percent? (Round the intermediate calculations to 2 decimal places. Round the final answer to the next whole number.) Desired Confidence (%) 90 95 95.5 98 99 Z Value 1.65 1.96 2.00 2.33 2.58

2. How many observations should a stopwatch time-study analyst plan for in a task that has a standard deviation of 1.31 minutes per piece if the goal is to estimate the mean time per piece to within 0.2 minute with a confidence of 95.0 percent? (Round the intermediate calculations to 2 decimal places. Round the final answer to the next whole number.) 2. How many observations should a stopwatch time-study analyst plan for in a task that has a standard deviation of 1.31 minutes per piece if the goal is to estimate the mean time per piece to within 0.2 minute with a confidence of 95.0 percent? (Round the intermediate calculations to 2 decimal places. Round the final answer to the next whole number.)