A random sample of 30 executives from companies with assets over $1 million was selected and asked for their annual income and level of education. The ANOVA comparing the average income among three levels of education rejected the null hypothesis. The Mean Square Error (MSE) was 243.7. The following table summarized the results: 
When comparing the mean salaries to test for differences between treatment means, the t statistic is based on:
Definitions:
Labor Market
The labor market is an economic market in which workers seek employment and employers seek to hire workers, often influenced by factors like wages, demand, and qualifications.
Marginal Tax Rate
The rate at which the next dollar of taxable income is taxed, reflecting the incremental increase in tax paid on an additional dollar of income.
Average Tax Rate
The ratio of the total amount of taxes paid to the total taxable income, representing the percentage of income paid in taxes.
Proportional Tax
A tax system where the rate of taxation is the same for all taxpayers, regardless of income or wealth.
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