10.97 Two randomly selected groups of citizens were exposed to different media campaigns that dealt with the image of a political candidate. One week later, the citizen groups were surveyed to see whether they would vote for the candidate. The results were as follows:

Exposed to Exposed to Conservative Image Moderate Image Number in Sample 100 100 Proportion for the Candidate 0.40 0.50 Is there sufficient evidence to show a difference in the effectiveness of the two image campaigns at the 0.05 level of significance?

a. Solve using the p-value approach.

b. Solve using the classical approach.