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: Using $\alpha$ =.01, critical chi-square value is ___.
A) 15.09
B) 7.88
C) 9.21
D) 16.81
E) 17.89

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:  Using $\alpha$ =.01, critical chi-square value is ___.
A) 15.09 
B) 7.88 
C) 9.21 
D) 16.81 
E) 17.89

Quizplus · Accepted Answer

We need to find the critical chi-square value with 1 degree of freedom at a 0.01 level of significance. Looking at the chi-square distribution table, the value is 9.21. Therefore, choice C is the best answer.

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

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