TABLE 12-18 Two New Different Models of Compact SUVs Have Just Arrived

question 26

Multiple Choice

TABLE 12-18
Two new different models of compact SUVs have just arrived at the market. You are interested in comparing the gas mileage performance of both models to see if they are the same. A partial computer output for twelve compact SUVs of model 1 and thirteen of model 2 is given below:

You are told that the gas mileage population distributions for both models are not normally distributed.
-Referring to Table 12-18, what should be the null and alternative hypotheses of the test?

• A) H₀: M₁ = M₂ vs. H₁: M₁ ≠ M₂
• B) H₀: M₁ ≥ M₂ vs. H₁: M₁ < M₂
• C) H₀: M₁ ≤ M₂ vs. H₁: M₁ > M₂
• D) H₀: M₁ ≠ M₂ vs. H₁: M₁ = M₂

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Definitions:

Cronbach's Alpha

A measure of internal consistency that assesses how closely related a set of items are as a group, often used in survey research.

Internal Consistency

A measure of the reliability of a psychological test that assesses the extent to which different test items that propose to measure the same general construct produce similar results.

Cohen's Kappa

Cohen's Kappa is a statistical measure used to assess the reliability of inter-rater agreement for qualitative (categorical) items, correcting for the chance of agreement.

Item-total Correlation

The relationship between individual item scores and the overall score across all items in a test or questionnaire.