A sample of 55 research cotton samples resulted in a sample average percentage elongation of 8.17 and a sample standard deviation of 1.43. Calculate 95% large-sample CI for the true average percentage elongation u. (Round your answers to three decimal places.) 8.557 |× ) 7.783 What assumptions are you making about the distribution of percentage elongation? O We assume the distribution of percentage elongation is normal with the value of o known. O we assume the distribution of percentage elongation is uniform. O We assume the distribution of percentage elongation is normal with the value of o unknown. O we make no assumptions about the distribution of percentage elongation.

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