Question: An electronics engineer is interested in the effect on tube conductivity of five different types of coating for cathode ray tubes in a telecommunications system

An electronics engineer is interested in the effect on tube conductivity of five different types of coating for cathode ray tubes in a telecommunications system display device. The following conductivity data are obtained.

(a) Is there any difference in conductivity due to coating type? Use a = 0.01.
(b) Analyze the residuals from this experiment.
(c) Construct a 95% interval estimate of the coating type 1 mean. Construct a 99% interval estimate of the mean difference between coating types 1 and 4.

Coating Type Conductivity 143 141 150 146 2 152 149 137 143 134 133 132 127 129 127 132 129 147 148 144 142

Coating Type Conductivity 143 141 150 146 2 152 149 137 143 134 133 132 127 129 127 132 129 147 148 144 142

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