We are testing whether a particular program of low impact exercise can improve the cholesterol level of stroke patients. We enroll a group of stroke patients in our study, and after six weeks we measure their serum cholesterol level in mmol/L, resulting in the following data: 7.1 7.4 8.7 4.7 4.6 3.9 4.6 7.1 9.1 7.2 8.6 8.1 6.3 8 5.9 8.5 8.4 8 7.4 5.9 4.6 3.8 5.4 8.1 7.7 9.3 7.8 5.3 9 7.2 8.1 6.1 8.6 9.5 7.8 7.6 7.4 4.1   Construct a 92% confidence interval

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