Use the formula for CI, CI = X z (sx/n), to answer the following questions.

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Use the formula for CI, CI  = X̅ ± z (sx/√n), to answer the following questions.

a. What can a researcher do to z* to make a CI narrower?

b. What can a researcher do to n to make a CI wider?

c. If a researcher wanted to maximize her chances of creating a CI that includes μ, what should she do to z* and n?

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