Cotton Percentage 15 20 25 30 35 1 7 12 14 19 7 Observations 2 7 17 18 25 10 3 15 12 18 22 11 4 11 18 19 19 15 s 9 18 19 23 11 (a) Does cotton percentage affect breaking strength? Draw comparative box plots and perform an analysis of variance. Use a P-value approach. (c) Which specific means are different? (d) Perform residual analysis and model checking. (b) Plot average tensile strength against cotton percentage and interpret the results.

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