a] 3.18. A manufacturer of tcicvision sets is interested in the effect on tubc 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
(b) (c)
Is there a difference in conductivity due to coating type? Use a = 0.05. Estimate the overall mcan 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 I and 4.



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