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A sample of 53 research cotton samples resulted in a sample average percentage elongation of 8.18...

A sample of 53 research cotton samples resulted in a sample average percentage elongation of 8.18 and a sample standard deviation of 1.41. Calculate a 95% large-sample CI for the true average percentage elongation μ. (Round your answers to three decimal places.)

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What assumptions are you making about the distribution of percentage elongation?

a. We assume the distribution of percentage elongation is normal with the value of σ unknown.

b. We assume the distribution of percentage elongation is uniform.   

c. We assume the distribution of percentage elongation is normal with the value of σ known.

d. We make no assumptions about the distribution of percentage elongation.

Math   Statistics-And-Probability   
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