Arandomized study compared two drugs that are designed to lower a person's triglyceride level. it was found that over a 1-year period, those receiving drug a decreased their triglyceride level by a mean of 69. those receiving drug b decreased their triglyceride level by a mean of 45. to determine whether the results are significant, the data are rerandomized and the difference of the means is shown in the dot plot. what is the best conclusion to make based on the data?