Calculate a 95% confidence interval (Chapter 17) for the mean Cholesterol of heart disease patients.

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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Summary statistics for Chol:

(a)  Calculate a 95% confidence interval (Chapter 17) for the mean Cholesterol of heart disease patients.  Use the t-distribution table and the Cholesterol summary statistics.
Group by: HD

HD n Mean Variance Std. dev. Std. err. Median Range Min Max Q1 Q3
No 164 242.64024 2857.606 53.45658 4.1742576 234.5 438 126 564 208.5 267.5
Yes 139 251.47482 2448.9468 49.486835 4.1974185 249 278 131 409 217 284
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