Question

In the LA Time’s October 2010 poll of likely California voters, 480 of 922 surveyed were likely to vote for Jerry Brown in the governor's race. In September, in a similar poll of 760 likely voters, 350 indicated they were likely to vote for Brown. Construct a 95% confidence interval for the difference in proportions for the two polls. Can we conclude that support for Brown has increased over the period covered by the two polls? Explain. (Explanations should be brief, but must be clear and use complete sentences with proper grammar!) STAT50

Answer 1