Researchers in the nutrition department at a large university conducted a study with 10,000 women. whether a given individual would be assigned to take vitamin c or the placebo was determined by flipping a coin. as a result, about 5,000 women were assigned to take vitamin c and about 5,000 to take the placebo. the researchers summarized the results of the experiment by using percentages. of the women taking vitamin c, 3.4% got a cold, compared to 25.6% of those taking the placebo. based on the observed results, the study authors concluded that taking vitamin c reduces the risk of getting a cold. the generalization that vitamin c reduces the risk of getting a cold is what aspect of the study?