A sample of 56 research cotton samples resulted in a sample average percentage elongation of 8.12 and a sample standard deviation of 1.45. Calculate a 95% large-sample CI for the true average percentage elongation . (Round your answers to three decimal places.) , What assumptions are you making about the distribution of percentage elongation? We assume the distribution of percentage elongation is normal with the value of known. We make no assumptions about the distribution of percentage elongation. We assume the distribution of percentage elongation is uniform. We assume the distribution of percentage elongation is normal with the value of unknown