3. Problem [Dataset 3-22] 3-6. A manufacturer of television sets is interested in the effect on tube conductivity of four different types of coating for color picture tubes. The following conductivity data are obtained: Coating Type Conductivity 143 141 150 146 152 149 137 143 AWN- 134 136 132 127 129 127 132 129 (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 confidence interval estimate of the mean of coating type 4. Compute a 99 percent confidence interval estimate of the mean difference between coating types 1 and 4. (d) Test all pairs of means using the Fisher LSD method with a = 0.05. (e) Use the graphical method discussed in Section 3-5.3 to compare the means. Which coating type produces the highest conductivity? (f) Assuming that coating type 4 is currently in use, what are your recommendations to the manufacturer? We wish to minimize conductivity. Note: Skip (e)