Question: Q4 Computer upgrade times (in minutes) are being evaluated. Samples of five (5) observations each have been taken, and the results are listed in the

Computer upgrade times (in minutes) are being evaluated. Samples of five (5) observations each have been taken, and the results are listed in the table below.

SAMPLES 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

81.0 / 80.1 / 80.8 / 80.6 / 78.8 / 81.1

a) Determine UCL and LCL for mean and range charts.

b) Is this process in control?

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