In Constructing a Confidence Interval for a Mean with Unknown

question 95

Multiple Choice

In constructing a confidence interval for a mean with unknown variance with a sample of 25 items, Bob used z instead of t. "Well, at least my interval will be wider than necessary, so it was a conservative error," said he. Is Bob's statement correct?

• A)Yes.
• B)No.
• C)It depends on μ.

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