Confidence interval for the mean
Assume that the paired data came from a population that is normally distributed. Construct a 95% confidence interval for the mean of all differences x-y.
x(sub i): 9, 8, 16, 3, 9, 17, 10, 5
y(sub i): 5, 8, 14, 8, 8, 13, 12, 9
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The width of a confidence interval is defined to be the upper bound of the confidence interval minus the lower bound of the confidence interval. For example, if a confidence interval is (-2.34,9.87), then the width of this confidence interval is 9
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