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A movie company wishes to measure the effect of advertising on box office receipts. Thirty U.S. cities with similar demographics are chosen for an experiment. The thirty cities are randomly divided into three groups of ten cities. In each city a trailer for a new film will be run on a local cable station during prime time in the week leading up to the release of the film. In the first group of ten cities the trailer will be run 500 times, in the second group the trailer will be run 1,000 times, and in the third group it will be run 1,500 times.The company will collect the box office receipts for the opening weekend of the film in each city and compare themean box office receipts.

Explain why this is a designed experiment.

Identify the factor and the response variable.

Is the factor quantitative or qualitative?

Identify the factor levels and the experimental units.

What part of choosing the cities is not necessarily random?

Explain why it might be difficult to randomize this part of the experiment.