Reconsider Exercise 13 9 in which the effect of different coating types on conductivity was investigated Suppose that the five coating types were selected at random from a large number of types (a) How does this change the interpretation of the experiment (b) What is an appropriate statistical model for this experiment (c) Estimate the parameters of this model Exercise 13 9 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 Conductivity 150 137 132 132 144 Coating Type 143 152 134 129 147 146 143 127 129 142 141 149 133 127 3 4 148 144

Question: Reconsider Exercise 13-9 in which the effect of different coating types on conductivity was investigated. Suppose that the five coating types were selected at random

Reconsider Exercise 13-9 in which the effect of different coating types on conductivity was investigated. Suppose that the five coating types were selected at random from a large number of types.

(a) How does this change the interpretation of the experiment?

(b) What is an appropriate statistical model for this experiment?

Exercise 13-9

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.

Conductivity 150 137 132 132 144 Coating Type 143 152 134 129 147 146 143 127 129 142 141 149 133 127 3 4 148 144

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