Question

The employees in an insurance company's mailroom are responsible for sorting and delivering the incoming U.S. mail to the correct departments. These employees have been receiving numerous complaints that mail is being delivering to the wrong departments. To better understand these complaints, the mailroom employees recorded the number of these complaints they received each day for the last 20 working days (Monday through Friday for the last 4 weeks). The data, in the order of the last 20 working days, is given below.

Week 1 Week 2 Week 3 Week 4 Monday 13 Monday 12 Monday 12 Monday 12 Tuesday 5 Tuesday 6 Tuesday 5 Tuesday 4 Wednesday 14 Wednesday 12 Wednesday 12 Wednesday 9 Thursday 11 Thursday 11 Thursday 9 Thursday 15 Friday 9 Friday 15 Friday 10 Friday 9

Plot these data on a run chart. What conclusion can you make about the number of complaints received over the last 4 weeks?

Answer 1

Week	Day	Day Number	Complaints
1	Mon	1	13
1	Tue	2	5
1	wed	3	14
1	Thus	4	11
1	Fri	5	9
2	Mon	6	12
2	Tue	7	6
2	wed	8	12
2	Thus	9	11
2	Fri	10	15
3	Mon	11	12
3	Tue	12	5
3	wed	13	12
3	Thus	14	9
3	Fri	15	10
4	Mon	16	12
4	Tue	17	4
4	wed	18	9
4	Thus	19	15
4	Fri	20	9

As shown in run chart, the number of complaints received on every Tuesday is low and for the rest of days in a week it is fairly constant. The employees working on Tuesday are more efficient than the rest of days in a week. Thus, study and analysis the sorting and delivering process during the Tuesday and replicate the process for remaining days of week.

Number of Compliants 16 14 10 6 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Days in week

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