The Super Bowl, watched by close to 200 million Americans, is also a big event for advertisers. The file Super Bowl Ad Ratings contains the rating of ads that ran between the opening kickoff and the final whistle.
For ads that ran before halftime and ads that ran at halftime or after separately:
a. Construct a 95% confidence interval estimate for the population mean ad rating.
b. Interpret the interval constructed in (a).
c. What conclusions can you reach about the ad ratings of ads that ran before halftime and ads that ran at halftime or after?
d. What assumption must you make about the population distribution in order to construct the confidence interval estimate in (a)?
e. Do you think that the assumption needed in order to construct the confidence interval estimate in (a) is valid? Explain.