Question: Singtel is investigating the processing time for optic fibre installation appointments. Samples that have been taken from 4 branches for 25 random days are shown

Singtel is investigating the processing time for

Singtel is investigating the processing time for optic fibre installation appointments. Samples that have been taken from 4 branches for 25 random days are shown in the following table: tvo MASSO Optic Fibre Installation Processing time Day Branch 1 Branch 2 Branch 3 Branch 4 1 15 12 24 22 2 14 13 23 17 3 23 17 26 13 4 20 16 31 19 5 11 14 26 15 6 24 13 28 14 7 13 19 25 11 8 17 25 31 24 9 22 16 30 21 10 22 16 25 14 11 16 14 28 22 12 23 22 27 25 13 15 12 21 20 14 18 19 14 15 7 10 12 6 16 25 14 16 22 17 19 11 24 18 4 18 32 8 19 14 11 24 10 20 27 21 32 13 21 24 12 16 21 22 13 14 18 23 20 11 19 24 24 19 21 31 21 25 14 17 28 23 co u 26 20 25 Assess the process output by calculating the control limits and developing X-bar control chart using the data given. Does the process appear to be in statistical control? Why or why not? (25 marks)

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