Organic chemists often purify organic compounds by a method known as fractional crystallization. one chemist prepared ten 4.85-g quantities of aniline and purified it to acetanilide. the following dry yields were recorded.

3.83 3.78 3.86 3.83 3.90 3.35 3.61 4.03 3.71 3.85

estimate the mean grams of acetanilide that can be recovered from an initial amount of 4.85 g of aniline. use a 95% confidence interval. (round your answers to three decimal places.)

Farmers know that driving heavy equipment on wet soil compresses the soil and injures future crops. here are data on the "penetrability" of the same type of soil at two levels of compression. penetrability is a measure of how much resistance plant roots will meet when they try to grow through the soil. compressed soil 2.85 2.66 3 2.82 2.76 2.81 2.78 3.08 2.94 2.86 3.08 2.82 2.78 2.98 3.00 2.78 2.96 2.90 3.18 3.16 intermediate soil 3.17 3.37 3.1 3.40 3.38 3.14 3.18 3.26 2.96 3.02 3.54 3.36 3.18 3.12 3.86 2.92 3.46 3.44 3.62 4.26 use the data, omitting the high outlier, to give a 95% confidence interval for the decrease in penetrability of compressed soil relative to intermediate soil. compute degrees of freedom using the conservative method. interval: to