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What is the relationship between a 90% confidence interval around a mean and a 95% confidence interval around a mean?
a. The 90% C.I. is wider and includes more values than the 95% C.I.
b. The 95% C.I. is more precise in estimating a mean than the 90% C.I.
c. The 90% C.I. is more precise in estimating a mean than the 95% C.I.
d. The 95% C.I. is narrower and includes less values than the 90% C.I.

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