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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, observed chi-square value is ______________.
a) 24.93
b) 4.44
c) 32.89
d) 51.79
e) 54.98

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