Statistics-AW-Q256

Statistics-AW-Q256 Online Services

Problem 1:

Computer upgrade times (in minutes) are being evaluated. Samples of five observations each have been taken, and the results are listed. Using the table below determine upper and lower control limits for mean and range charts, and decide if the process is in control.

1. Calculate the Upper Control Limit and Lower Control Limit for the Mean chart.
b. Calculate the Upper Control Limit and Lower Control Limit for the Range chart.
c. Plot the Mean Chart and the Range Chart.
d. Decide if the process is in control or not.

 Sample 1 2 3 4 5 6 79.2 80.5 79.6 78.9 80.5 79.7 78.8 78.7 79.6 79.4 79.6 80.6 80.0 81.0 80.4 79.7 80.4 80.5 78.4 80.4 80.3 79.4 80.8 80.0 81 80.1 80.8 80.6 78.8 81.1

 Number of Observations in Sample, n Factor for Chart, A2 Factors for R Charts Lower Control Limit, D3 Upper Control Limit, D4 2 1.88 0 3.27 3 1.02 0 2.57 4 0.73 0 2.28 5 0.58 0 2.11 6 0.48 0 2.00 7 0.42 0.08 1.92 8 0.37 0.14 1.86 9 0.34 0.18 1.82 10 0.31 0.22 1.78

Product Code-Statistics-AW-Q256

Summary