A sample of 56 research cotton samples resulted in asample average percentage elongation of 8.17 and asample standard deviation of 1.42 (“An ApparentRelation Between the Spiral Angle f, the PercentElongation E1, and the Dimensions of the CottonFiber,” Textile Research J., 1978: 407–410). Calculatea 95% large-sample CI for the true average percentageelongation m. What assumptions are you making aboutthe distribution of percentage elongation?

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