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A manufacturer of television sets is interested in the effect on tube conductivity of four different...

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Question

Basic Math

A manufacturer of television sets is interested in the effect ontube conductivity of four different types of coating for colorpicture tubes. A completely randomized experiment is conducted, andthe 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

a) Is there a difference in conductivity due to a coating type?Use ?= 0.05.

b) Estimate the overall mean and the treatment effects.

c) Calculate a confidence interval with 95% for the averagecoating type 4 and calculate the confidence interval with 99% forthe difference between the average coating types 1 and 4.

d) Test all pairs of means using the Fisher LSD method with ?=0.05.

e) Use the graphical method discussed in section 3-5.3 tocompare the means. What is the type of coating which produces thehighest conductivity?

f) Assuming that coating type 4 is currently being used, whatwould you recommend to manufacturer? It wants to minimizeconductivity.

g) Analyze the residuals and draw conclusions about the adequacyof the model.

Answer & Explanation Solved by verified expert
4.1 Ratings (618 Votes)
SOLUTIONcSEsqrtMS errorrsqrt882744795 confidence interval type    See Answer
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