Amanufacturer of television sets is interested in the effect on tube conductivity of four different types of coating for color picture tubes. a completely randomized experiment 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 is there a difference in conductivity due to coating type? use α = 0.05 . estimate the overall mean and the treatment effects. 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. test all pairs of means using the fisher lsd method wit