Small sample: Twenty nine concrete blocks were sampled and tested for crushing strength in order to estimate the proportion that were sufficiently strong for a certain application. Twenty seven of the 29 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. A 95% confidence interval for the proportion of blocks that are sufficiently strong is 0.8388