short ads and extremely long ads will be less effective than ads that are somewhere in the middle. She recruits $200$ participants and randomly sorts them into three groups, each of which watched an ad for a new relaxation drink. Each of the ads features snowboarders going down a mountainside and ramping over a can of the beverage. The first group watches a version of this ad that is $5$ seconds long; the second watches a version of the ad that is $30$ seconds long; and the final group watches a version of the ad that is $55$ seconds long. After the ad is over, she asks participants to rate their interest in buying the beverage $(1-5$ Likert$-$type scale, continuous variable$).$ Does the length of the ad affect participants' interest in the product?