Results of a poll evaluating support for drilling for oil and natural gas off the coast of California were introduced in Exercise 6.23.

(a) What percent of college graduates and what percent of the non-college graduates in this sample support drilling for oil and natural gas off the Coast of California? 

(b) Conduct a hypothesis test to determine if the data provide strong evidence that the proportion of college graduates who support off-shore drilling in California is different than that of non-college graduates.

Data from Exercise 6.23

A survey asked 827 randomly sampled registered voters in California "Do you support? Or do you oppose? Drilling for oil and natural gas off the Coast of California? Or do you not know enough to say?" Below is the distribution of responses, separated based on whether or not the respondent graduated from college.

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Support Oppose Do not know Total College Grad No 132 126 131 389 Yes 154 180 104 438