Bibliography (7):

1. Identifying the Persuasive Effects of Presidential Advertising

2. Political Advertising and Election Results

3. How Large and Long-lasting Are the Persuasive Effects of Televised Campaign Ads? Results from a Randomized Field Experiment

4. How Quickly We Forget: The Duration of Persuasion Effects From Mass Communication

5. The Minimal Persuasive Effects of Campaign Contact in General Elections: Evidence from 49 Field Experiments

6. Wikipedia Bibliography:

   1. Confidence interval

   2. Statistical-significance