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.
A)H0: μ1 ≠ μ2 ≠ μ3 ≠ μ4 vs.the alternative that all the wire type mean resistances are equal
B)H0: μ1 = μ2 = μ3 = μ4 = μ5 vs.the alternative that not all the wire size mean resistances are equal
C)H0: μtype ≠ μsize vs.the alternative that wire type and wire size mean resistances are equal
D)H0: μ1 ≠ μ2 ≠ μ3 ≠ μ4 ≠ μ5 vs.the alternative that all the wire size mean resistances are equal
E)H0: μ1 = μ2 = μ3 = μ4 vs.the alternative that not all the wire type mean resistances are equal

Question

Quizplus · Accepted Answer

The correct hypothesis is comparing the mean resistances of the four wire types, assuming they are equal under the null hypothesis and not all equal under the alternative hypothesis. The question is about comparing wire types, not sizes, and there are four types, not five.

An Electrical Engineer Wants to Compare the Resistance of Four