A pharmaceutical company is interested in comparing four brands of sleep medication to see which brand is best at relieving sleep pattern symptoms, primarily insomnia. The participants are 80 people with sleep pattern symptoms. They are randomly assigned to four groups of 20 participants. Each group receives one of the four brands of sleep medication. The improvement in the sleep pattern of the 80 participants is recorded 6 weeks after taking the medication and the average improvement is compared among the four treatment groups. What are the factor(s) and level(s) of this scenario?

The factor is the
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insomnia
pharmaceutical company
Sleep medication

The levels are the
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4 different medications/treatments
6 weeks of the experiment
20 subjects in each group