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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 90 10 20
$50,000 or More 60 60 60

Using a= .01, critical chi-square value is ______________.
a) 15.09
b) 7.88
c) 9.21
d) 16.81
e) 17.89

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