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"

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.  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"

Quizplus · Accepted Answer

The null hypothesis in this case is that "income" is independent of "type of gasoline." This means that there is no relationship between the two variables, and any observed correlation is due to chance. The alternative hypothesis, which is not given in the question, would be that "income" does influence "type of gasoline."

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