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In Constructing a Confidence Interval for a Mean with Unknown

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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?


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A corporation that is created by private persons and does not have government duties.

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An official document issued by a state government recognizing the formation of a corporation and outlining its basic details.

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The status granted to a company or individual that fulfills the regulatory requirements to legally operate in a particular jurisdiction.

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A company that operates like a corporation and may be treated as one for legal purposes, despite not having completed formal incorporation steps.

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