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

question 162

Short Answer

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 is the value of the Wilcoxon rank sum test statistic T₁?

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Definitions:

Direct Adjustment

A statistical method used to eliminate the effects of confounding variables by standardizing to a common distribution.

Indirect Adjustment

A statistical method used to control or modify the effects of confounding variables on a primary relationship of interest by applying correction factors derived from external data.

Infant

A child in the earliest stage of life, typically defined as being from birth up to one year of age.

Age-Adjusted Mortality Rate

A mortality rate statistically modified to eliminate the effect of different age distributions in different populations.