A Gasoline Distributor Wonders Whether an Individual's Income Level Influences

Multiple Choice

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 ___.

A) "income" is independent of "type of gasoline"
B) "income" influences "type of gasoline"
C) "income" is not independent of "type of gasoline"
D) "income" is related to "type of gasoline"
E) "regular" is independent of "premium"