In an article in the journal of advertising, weinberger and spotts compare the use of humor in television ads in the united states and the united kingdom. they found that a substantially greater percentage of u. k. ads use humor. (a) suppose that a random sample of 387 television ads in the united kingdom reveals that 130 of these ads use humor. find a point estimate of and a 95 percent confidence interval for the proportion of all u. k. television ads that use humor.