a. Determine three-sigma control limits using the above data. (Round your intermediate calculations to 4 decimal places and final answers to 3 decimal places. Leave no cells blank - be certain to enter "0" wherever required. Round up any negative control limit value to zero.) UCL LCL b. Is the process in control? Yes O No

Big Ideas Math A Bridge To Success Algebra 1: Student Edition 2015
1st Edition
ISBN:9781680331141
Author:HOUGHTON MIFFLIN HARCOURT
Publisher:HOUGHTON MIFFLIN HARCOURT
Chapter9: Solving Quadratic Functions
Section: Chapter Questions
Problem 4CA
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please answer both parts a and b within 30 minutes.

The postmaster of a small western town receives a certain number of complaints each day about mail delivery.
DAY
7
5
Number of complaints
UCL
LCL
b. Is the process in control?
1
Ⓒ Yes
O No
4
2
11
3
16
4
8
5
9
6
6
a. Determine three-sigma control limits using the above data. (Round your intermediate calculations to 4 decimal places
and final answers to 3 decimal places. Leave no cells blank - be certain to enter "0" wherever required. Round up any negative
control limit value to zero.)
8 9
12 14
10 11 12 13 14
7
6 4 2 9
Transcribed Image Text:The postmaster of a small western town receives a certain number of complaints each day about mail delivery. DAY 7 5 Number of complaints UCL LCL b. Is the process in control? 1 Ⓒ Yes O No 4 2 11 3 16 4 8 5 9 6 6 a. Determine three-sigma control limits using the above data. (Round your intermediate calculations to 4 decimal places and final answers to 3 decimal places. Leave no cells blank - be certain to enter "0" wherever required. Round up any negative control limit value to zero.) 8 9 12 14 10 11 12 13 14 7 6 4 2 9
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