EBK BUSINESS STATISTICS
7th Edition
ISBN: 8220102743984
Author: STEPHAN
Publisher: PEARSON
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i need help on parts a,b and c.
essary.
Question 3:
Problem Statement:
In the textile manufacturing industry, ensuring the quality of fabric rolls is crucial to meet
customer requirements and maintain product consistency. Your task is to perform Acceptance
Sampling analysis on a dataset of fabric quality inspections and draw conclusions based on your
analysis.
Data:
Below is a dataset of fabric tensile strength measurements (in kilonewtons per meter, kN/m)
collected from a sample of fabric rolls produced in a textile manufacturing facility:
35.2, 34.8, 35.0, 35.1, 35.3, 35.0, 35.2, 34.9, 35.1, 35.0,
34.9, 35.2, 35.1, 35.3, 35.0, 35.2, 34.9, 35.1, 35.0, 35.2
1. Calculate Control Limits:
- Compute the mean (X-bar) and standard deviation (σ) of the tensile strength measurements.
- Determine the Upper Control Limit (UCL) and Lower Control Limit (LCL) using the mean
and standard deviation.
2. Construct X-bar Chart:
- Plot the tensile strength measurements on a time-ordered X-bar chart.
- Add the UCL and LCL lines to the…
Chapter 6 - Problem 3
DBC, a manufacturer of high end racing bicycles, is interested in determining the cost
associated with the warranty costs on their bicycles. Three cost drivers are believed to be
important in explaining the cost of this activity: the speed (ft/min.) of the manufacturing
line, the number of defective products produced and the hours of inspection. To
determine if this hypothesis is valid, the company's analysts examined the past 3 years of
warranty cost data and ran a multiple regression analysis. The following output is
obtained:
Parameter
Intercept
Line Speed
Number of defects
Inspection hours
R² = 0.88
Observations 250
Questions:
1.
2.
3.
4.
Estimate
3,300
25
50
-15
t-stat
80.00
5.31
2.58
-1.96
Pr>t
.0001
.0033
.0050
.0250
Determine the estimated cost model for DBC's warranty repair cost.
If DBC expects to run their line at 30 ft/ min. and to have 65 defects per week and to
spend 40 hours on inspection, what is their anticipated warranty repair cost?
Is Line…
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