Please answer these questions and provide the R-code used to reach these conclusions :)

3.20 A manufacturer of television sets is interested in the effect on tube conductivity of four different types of coat- ing for color picture tubes. A completely randomized exper- iment is conducted and the following conductivity data are obtained: ---..__________________ Coating Type Conductivity ________________ 1 143 141 150 146 2 152 149 137 143 3 134 136 132 127 4 129 127 132 129 ----__._._____________ (a) Is there a difference in conductivity due to coating type? Use a = 0.05. (b) Estimate the overall mean and the treatment effects. (c) Compute a 95 percent condence interval estimate of the mean of coating type 4. Compute a 99 percent condence interval estimate of the mean difference between coating types 1 and 4. (d) Test all pairs of means using the Fisher LSD method mma=ow. (1') Assuming that coating type 4 is currently in use, what are your recommendations to the manufacturer? We wish to Ininimize'conductivity