An Electrical Engineer Wants to Compare the Resistance of Four

question 22

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.How many degrees of freedom does the treatment sum of squares have? How about the error sum of squares?

• A)df-treatment = 4; df-error = 19
• B)df-treatment = 3; df-error = 17
• C)df-treatment = 3; df-error = 16
• D)df-treatment = 4; df-error = 20
• E)df-treatment = 3; df-error = 19

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