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[See Solution] In a sample of 100 people who have had strokes, the average cholesterol level was 240 with a standard deviation of 40. In another sample

Question: In a sample of 100 people who have had strokes, the average cholesterol level was 240 with a standard deviation of 40. In another sample of 250 people who did not have strokes, the average cholesterol level was 150 with a standard deviation of 35. Approximate using the z-distribution.

  1. Find the 99% confidence level of the average cholesterol level of people who had a stroke.
  2. Test at the 5% level of significance, that the average cholesterol level for people who had a stroke is at least 70 points higher than people who had not had a stroke.

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