A polling organization conducted surveys of randomly selected Americans 18 years old ...

A polling organization conducted surveys of randomly selected Americans 18 years old or older and asked whether they support the legalization of medicinal marijuana. The frequencies of reported opinions, by age group, are presented in the table.
AGE
18-29 30-49 50 OR OLDER
FOR 105 145 120
AGAINST 62 141 66
 

(a) Test the independence of age and opinion at the a=0.05 level of significance.
(b) Compute the P-value for this test by finding the area under the chi-square distribution to the right of the test. (round to three decimal places as needed)
(c) Construct a conditional distribution by age and draw a bar graph.