In: Statistics and Probability
Farmers know that driving heavy equipment on wet soil
compresses the soil and injures future crops....
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
2.8 2.67 2.91 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
3.15 3.38 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 99.5%
confidence interval for the decrease in penetrability of compressed
soil relative to intermediate soil. Compute degrees of freedom
using the conservative method.
Interval: to