An Electrical Engineer Wants to Compare the Resistance of Four

question 25

Multiple Choice

An electrical engineer wants to compare the resistance of four types of wire made from different materials.Five wires of equal lengths and cross sectional areas are prepared for each of the four wire types.Each section of wire is randomly tested by sending a current through the wire and measuring the resistance.Calculate MST,MSE and the F-ratio.Can you reject H0 using α = 0.05? The ANOVA table is listed below. Analysis of Variance
Source Sum-of-Squares df Mean-Square F-ratio P-value
WireType 293.745
Error 1456.131
Total 1749.876

• A)MST = 97.915; MSE = 91.008; F-Ratio = 1.076; No,do not reject H0 using α = 0.05.
• B)MST = 97.915; MSE = 85.655; F-Ratio = 1.143; No,do not reject H0 using α = 0.05.
• C)MST = 97.915; MSE = 76.638; F-Ratio = 1.278; Yes,reject H0 using α = 0.05.
• D)MST =73.436; MSE = 76.638; F-Ratio = 0.958; No,do not reject H0 using α = 0.05.
• E)MST =73.436; MSE = 72.807; F-Ratio = 1.009; No,do not reject H0 using α = 0.05.

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