question: <image 1> Ten individuals went on a low-fat diet for 12 weeks to lower their cholesterol. The data are recorded in Table 10.20. At the 5% significance level, do you think that their cholesterol levels were significantly lowered?
  Options: A: there is insufficient evidence to conclude that the medication lowered cholesterol levels after 12 weeks, B: there is sufficient evidence to conclude that the medication lowered cholesterol levels after 12 weeks, C: not certain, D: nan