TABLE 12-17 Three New Different Models of Compact SUVs Have Just Arrived

question 72

Short Answer

TABLE 12-17
Three new different models of compact SUVs have just arrived at the market.You are interested in comparing the gas mileage performance of all three models to see if they are the same.A partial computer output for twelve compact SUVs of each model is given below: You are told that the gas mileage population distributions for all three models are not normally distributed.
-Referring to Table 12-17,what are the degrees of freedom of the Kruskal-Wallis test statistic?

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Definitions:

Level of Significance

Another term for significance level, indicating the criterion used for rejecting the null hypothesis in statistical hypothesis testing.

Treatment Sum

The total sum of all the values of the outcome variable for a specific treatment level in an experimental design.

Squared Deviations

The squares of the differences between each data point in a data set and the mean of that data set, used in various statistical calculations.

Grand Mean

The grand mean is the mean of means, calculated by taking the average of the mean values from multiple groups or samples within the data.