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Confidence interval for the quality difference

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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

Reference no: EM131444448

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