A gasoline distributor wonders whether an individual's income level influences the grade of gasoline purchased. The following is a contingency table from a random sample of 300 individuals: 
The null hypothesis is ___.
Definitions:
TFC
stands for Total Fixed Costs, which are the costs that do not vary with the level of production or sales, such as rent or salaries.
Average Fixed Cost
The fixed costs of production divided by the quantity of output produced, showing the cost of each unit's share of the fixed expenses.
Average Variable Cost
Average variable cost is the total variable cost divided by the quantity of output produced, indicating the variable cost incurred per unit of output.
Total Cost
The sum of all costs incurred by a business in producing a given level of output, including fixed and variable costs.
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