A Sample of 20 Items from a Population with an Unknown

question 35

Multiple Choice

A sample of 20 items from a population with an unknown σ is selected in order to develop an interval estimate of μ. Which of the following is not necessary?

• A) We must assume the population has a normal distribution.
• B) We must use a t distribution.
• C) Sample standard deviation must be used to estimate σ.
• D) The sample must have a normal distribution.

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