An electrical rm manufactures light bulbs that have a length of life that is approximately normally distributed with a standard deviation of 40 hours. If a sample of 30 bulbs has an average life of 780 hours, nd a 96% condence interval for the population mean of all bulbs produced by this rm.

ST 512 Week 12 Notes MaLyn Lawhorn October 30, 2017 and November 1, 2017 Analysis of Covariance Model (ANCOVA) An ANCOVA model is one in which the experimental and confounding factors do not interact. We have three different categories of terms in the model ▯ Y -response variable ▯ X ;1▯▯ ;X...