A textile manufacturer is concerned about the strength of cotton yarn. In order to nd out whether fiber length is an important factor in determining the strength of yarn, the quality control manager checked the fiber length (x) and strength (y) for a sample of 10 segments of yarn. The results are:

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Fiber Length I 85 82 75 Strength 99 99 93 223 22 2 2 2 2 103 73 97 76 91 73 94 96 135 92 120 70 88 74 92