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To help decide which of your two current suppliers deserves the larger contract next year, you have rated a random sample of plastic cases from each one. The data are a composite of several measurements, with higher numbers indicating higher quality. (Table 10.7.11)
1. Find the two-sided 95% confidence interval for the quality difference. Is there a significant difference in quality? How do you know?
Custom Cases Corp
International Plastics
54.3
93.6
58.8
69.7
77.8
87.7
81.1
96.0
54.2
82.2
78.3
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