calculate the estimated interval
As part of a project to develop better lawn fertilizers, a research chemist wanted to determine the mean weekly growth rate of Kentucky bluegrass, a common type of grass. A sample of 250 blades of grass was measured, and the amount of growth in 1 week was recorded. Assuming that weekly growth is normally distributed with a standard deviation of 0.1 inch.
(a) Estimate with 99% confidence the mean weekly growth of Kentucky bluegrass.
Interpret the interval estimate you obtain in (a)