In the article A Functional Analysis Comparison ofWeb-Only Advertisements and Traditional Television Advertisements from the 2004 and

Question:

In the article "A Functional Analysis Comparison ofWeb-Only Advertisements and Traditional Television Advertisements from the 2004 and 2008 Presidential Campaigns" (Journalism & Mass Communication Quarterly, Vol. 90, No. 1, pp. 23-38), author C. Roberts explores whether a difference exists in purpose and content of web-only ads and television ads created by candidates in presidential campaigns. The following contingency table cross-classifies a sample of such advertisements by purpose and source. The purpose of the ad is classified as "acclaim" if the candidate acclaims himself/herself with positive statements about his/her credentials to be a better candidate. The purpose of the ad is classified as "attack" if the candidate attacks the opponent's credentials or defends with refutations against the opponent's attack.

a. Find P(S2).
b. Find P(S2 & P1).
c. Obtain P(P1 | S2) directly from the table.
d. Obtain P(P1 | S2) by using the conditional probability rule and your answers from parts (a) and (b).