Concerning confidence intervals, which statement is most nearly correct Why not the others a We should use z instead of t when n is large b We use the Student 's t distribution when is unknown c Using the Student 's t distribution instead of z narrows the confidence interval

Question: Concerning confidence intervals, which statement is most nearly correct? Why not the others? a. We should use z instead of t when n is large.

Concerning confidence intervals, which statement is most nearly correct? Why not the others?
a. We should use z instead of t when n is large.
b. We use the Student's t when is unknown.
c. Using the Student's t instead of z narrows the confidence interval.

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