Answered: 7. PCDrives has a statistically…

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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7. PCDrives has a statistically in-control manufacturing process that is normally distributed. Sample
means and ranges for 15 samples of size 5 can be found in the Problems Data workbook. Determine
process capability indexes by estimating the standard deviation using formula (8.34). If the
specifications are 70 ± 25, what percentage will be out of specification?

PCDrives

Sample	x-bar	R
1	77.4	18.3
2	60.2	20.1
3	63.5	22.6
4	64.0	27.5
5	58.4	15.3
6	74.4	17.9
7	70.8	26.8
8	74.6	30.6
9	77.3	19.2
10	65.7	14.6
11	63.4	24.5
12	76.6	21.7
13	71.7	25.5
14	70.9	29.7
15	59.6	14.5

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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