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Question

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.
Personal Type of Gasoline
Income Regular Premium Extra Premium
Less than $50,000 80 30 30
$50,000 or More 70 40 50

Using a= .05, observed chi-square value is ______________.
a) 15.79
b) 4.44
c) 32.89
d) 51.79
e) 5.79

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