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G A sample of 20 items from a population with an unknown s is selected in order to develop an interval estimate of m. Which of the following is not necessary? Group of answer choices We must assume the population has a normal distribution. We must use a t distribution. Sample standard deviation must be used to estimate . The sample must have a normal distribution.

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G A sample of 20 items from a population with an unknown s is selected in order to develop an interv...

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