A gasoline distributor wonders whether an individual's income levels influences the grade of gasoline purchased. 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 levels influences the grade of gasoline purchased.  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 always assumes that there is no relationship between the variables being studied, so in this case, the null hypothesis is that "income" is independent of "type of gasoline."

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