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Construct the confidence
x E  
x  0.4, E  6.027
 x E
0.4  6.027    0.4  6.027
5.6    6.4
We are 95% confident that the limits of –5.6 and 6.4
actually do contain the value of , the mean of the
changes in LDL cholesterol for the population. Because
the confidence interval limits contain the value of 0, it is
very possible that the mean of the changes in LDL
cholesterol is equal to 0, suggesting that the garlic
treatment did not affect the LDL cholesterol levels. It
does not appear that the garlic treatment is effective in
lowering LDL cholesterol.
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