Question

Cholesterol levels of 16 patients were taken following heart attacks at a major northeastern medical center. Cholesterol levels (mg/dL) were measured 2 days after the heart attack, and again on the same patients 14 days after the heart attack. Assume that the differences are normally distributed and that we can regard the sample as a simple random sample from the population. Based on the statistics provided below, what is the magnitude and direction of the effect? Ã2 days after = 260.125 S2 days after = 51.4922 Ã 14 days after = 216.75 S14 days after = 43.4258 G = 43.375 Ss = 51.42097 O It is estimated that mean cholesterol levels are 43.375 mg/dL higher 14 days after a heart attack than they are 2 days after a heart attack. It is estimated that mean cholesterol levels are 43.375 mg/dL lower 2 days after a heart attack than they are 14 days after a heart attack. It is estimated that mean cholesterol levels are 43.375 mg/dL higher 2 days after a heart attack than they are 14 days after a heart attack. It is estimated that mean cholesterol levels are not statistically differnent 2 days after a heart attack as they are 14 days after a heart attack.

The last answer is incorrect so it's between a, b, or c

Answer 1

The mean cholesterol level 2 days after a heart attack is equal to 260.125 while the mean cholesterol level 14 days after is 216.75. Their difference $\hat{\delta }$ comes out to be 43.375. This indicates that the mean cholesterol level 2 days after a heart attack is greater than 14 days after a heart attack. Option c should be the correct choice