Experiment, we can assume it is this if each of the volunteers were randomly assigned to the commercial times and repetition, Observational Study, it is not this because subjects did not get to choose which commercial (or how many times) they watched, compare, present because the same commercial was shown one, three or five times, control, present if subjects watched the same 40 minute program at the same time of day in the same atmosphere, randomization, we can assume that each subject had an equal chance of seeing the 30/90 second commercial, as well as the frequency of 1, 3, or 5 times during the programs, replication, present because there were 120 undergraduate students, Simplest Form Experiment, this is the type of experiment because all 120 undergraduate students were divided evenly without regard to characteristics that could affect the study, Block Design, would be desired if there were teenage subjects and adult subjects and we felt they would react differently to the commercial, subjects, 120 undergraduate students, explanatory variables (factors), length of commercial/number of repetitions, response variable, attitude toward the camera/recall of the ad, number of factors, two, number of treatments, six, confounding, would be present if all 30 second commercials were shown to math/science majors and all 90 second commercials were shown to liberal arts majors, statistical significance, we can conclude that the difference in the intention to purchase the camera between the groups is large enough, that it could not have happened by chance.

Experimental Design

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