3. A sample of 20 items from a population with an unknown o is selected in order to develop an interval estimate of u. Which of the following is not necessary? A. We must assume the population has a normal distribution. B. We must use t distribution. C. Sample standard deviation must be used to estimate the population standard deviation. D The sample must have a normal distribution.

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3. A sample of 20 items from a population with an unknown o is selected in order to develop an interval
estimate of u. Which of the following is not necessary?
A. We must assume the population has a normal distribution.
B. We must use t distribution.
C. Sample standard deviation must be used to estimate the population standard deviation.
D The sample must have a normal distribution.
Transcribed Image Text:3. A sample of 20 items from a population with an unknown o is selected in order to develop an interval estimate of u. Which of the following is not necessary? A. We must assume the population has a normal distribution. B. We must use t distribution. C. Sample standard deviation must be used to estimate the population standard deviation. D The sample must have a normal distribution.
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