H and I are most important to awnser!! 20. A teller at a drive-up window at a bank had the following service times (in minutes) for 20 randomselected customers.SAMPLE12344.54.64.54.74.24.54.64.64.24.44.44.84.34.74.44.54.34.34.64.9a. Determine the mean of each sample.b. If the process parameters are unknown, estimate its mean and standard deviation.c. Estimate the mean and standard deviation of the sampling distribution.d. What would three-sigma control limits for the process be? What alpha risk would they providee. What alpha risk would control limits of 4.14 and 4.86 provide?f. Using limits of 4.14 and 4.86, are any sample means beyond the control limits? If so, which one(sg. Construct control charts for means and ranges using Table 10.3. Are any samples beyond thecontrol limits? If so, which one(s)?h. Explain why the control limits are different for means in parts d and g.i. If the process has a known mean of 4.4 and a known standard deviation of .18, what wouldthree-sigma control limits be for a mean chart? Are any sample means beyond the controllimits? If so, which one(s)?

20. A teller at a drive-up window at a bank had the following service times (in minutes) for 20 randon selected customers. SAMPLE 1 2 3 4 4.5 4.6 4.5 4.7 4.2 4.5 4.6 4.6 4.2 4.4 4.4 4.8 4.3 4.7 4.4 4.5 4.3 4.3 4.6 4.9 a. Determine the mean of each sample. b. If the process parameters are unknown, estimate its mean and standard deviation. c. Estimate the mean and standard deviation of the sampling distribution. d. What would three-sigma control limits for the process be? What alpha risk would they provid e. What alpha risk would control limits of 4.14 and 4.86 provide? f. Using limits of 4.14 and 4.86, are any sample means beyond the control limits? If so, which one(: g. Construct control charts for means and ranges using Table 10.3. Are any samples beyond the control limits? If so, which one(s)? h. Explain why the control limits are different for means in parts d and g. i. If the process has a known mean of 4.4 and a known standard deviation of .18, what would three-sigma control limits be for a mean chart? Are any sample means beyond the control limits? If so, which one(s)?

20. A teller at a drive-up window at a bank had the following service times (in minutes) for 20 randon selected customers. SAMPLE 1 2 3 4 4.5 4.6 4.5 4.7 4.2 4.5 4.6 4.6 4.2 4.4 4.4 4.8 4.3 4.7 4.4 4.5 4.3 4.3 4.6 4.9 a. Determine the mean of each sample. b. If the process parameters are unknown, estimate its mean and standard deviation. c. Estimate the mean and standard deviation of the sampling distribution. d. What would three-sigma control limits for the process be? What alpha risk would they provid e. What alpha risk would control limits of 4.14 and 4.86 provide? f. Using limits of 4.14 and 4.86, are any sample means beyond the control limits? If so, which one(: g. Construct control charts for means and ranges using Table 10.3. Are any samples beyond the control limits? If so, which one(s)? h. Explain why the control limits are different for means in parts d and g. i. If the process has a known mean of 4.4 and a known standard deviation of .18, what would three-sigma control limits be for a mean chart? Are any sample means beyond the control limits? If so, which one(s)?

Practical Management Science

6th Edition

ISBN:9781337406659

Author:WINSTON, Wayne L.

Publisher:WINSTON, Wayne L.

Chapter2: Introduction To Spreadsheet Modeling

Section: Chapter Questions

Problem 20P: Julie James is opening a lemonade stand. She believes the fixed cost per week of running the stand...

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