Question: Small sample: Twenty one concrete blocks were sampled and tested for crushing strength in order to estimate the proportion that were sufficiently strong for

Small sample: Twenty one concrete blocks were sampled and tested for crushing

Small sample: Twenty one concrete blocks were sampled and tested for crushing strength in order to estimate the proportion that were sufficiently strong for a certain application. Ninteen of the 21 blocks were sufficiently strong. Use the small-sample method to construct a 95% confidence interval for the proportion of blocks that are sufficiently strong. Round the answers to at least three decimal places.

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