1. Mean chart and Range chart. Data file can be found under week 3 materials. For mean chart and range chart, please see data set under tab "mean chart and range chart". Question 14 to 19 are based on this data. Four samples of 10 observations are collected to analyze the performance of a call center performance. The data represents the time spent on each call. For example, in the first sample (visit 1), the first observation is 16 minutes for this call. With the control chart table (found under week 3 materials and attached with the data file), what is A2 to be used in mean chart? Round your answer to two decimals. For example, if your answer is 2.234, fill in 2.23.

1 points

QUESTION 15

1. Based on the last question, what is X-bar-bar? Round your answer to one decimal, for example, if your answer is 10.43, round it to be 10.4.

1 points

QUESTION 16

1. Similarly, what is R-bar? Round your answer to one decimal. For example, if your answer is 10.43, round it to 10.4.

1 points

QUESTION 17

1. What is the UCL for mean chart? Round your answer to two decimals.

1 points

QUESTION 18

1. What is the LCL for the R chart? Round your answer to two decimals.

1 points

QUESTION 19

1. Process in control?

n D4 wN 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Control chart factors A2 D3 1.88 0 1.023 0 0.729 0 0.577 0 0.483 0 0.419 0.076 0.373 0.136 0.337 0.184 0.308 0.223 0.285 0.256 0.266 0.283 0.249 0.307 0.235 0.328 0.223 0.347 0.212 0.363 0.203 0.378 0.194 0.391 0.187 0.404 0.18 0.415 0.173 0.425 0.167 0.435 0.162 0.443 0.157 0.452 0.153 0.459 3.267 2.575 2.282 2.114 2.004 1.924 1.864 1.816 1.777 1.744 1.717 1.693 1.672 1.653 1.637 1.622 1.609 1.596 1.585 1.575 1.565 1.557 1.548 1.541 Four samples of 10 observations are collected to analyze the performance of a call center performance. The data represents the time spent on each call. For example, in the first sample (visit 1), the first observation is 16 minutes for this call.Based on X-bar chart findings (notice that it is slightly different from last assignment on control charts), you want to further study whether the process conforms to the claim by the call center manager, stating that all calls are completed under 30 minutes (i.e., the specification for this performance is set at, UTL=30, LTL=0). Answer the following questions on process capability index. (Note: here we used table approach (A2, D3, D4 to find control limits) n= k= A2= range D3= D4= Visit 1 Visit 2 Visit 3 Visit 4 Obsevations (unit: minutes) 1 2 3 4 5 6 7 8 9 10 x-bar 16 13 24 21 121624 14 23 15 1415211625122711 23 8 24 1921 10|14|21|23|10|17| 10 21 16 2918 19 27 35 23 24 24 X-bar chart LCL= UCL= x-barbar= R-bar C Chart Sample 1 2 3 4 Number of Errors 7 15 13 8 5 17 6 7 12 28 17 8 20 9 10 14 9 11 16 22 6 12 12 13 14 15 16 17 18 19 24 19 15 13 20 6 P chart Day 1 Number Nonconforming 2 1 2 2 3 4 3 5 0 6 2 7 0 8 2 9 7 10 1 11 3 12 0 13 0 14 2 1 15 16 3 17 4 18 0 19 0 20 1 0 21 22 2 8 23 24 2 25 1 Obsevations 1 2 3 4 5 6 7 8 9 10 16 13 24 21 12162414 23 15 14 15 21 16 25 12 27 11 23 2419|2110|14212310|17| 10 211629 810273923 24 24 Visit 1 Visit 2 Visit 3 Visit 4 8