# Which of the following is not a condition for performing inference about a population mean U ? A) Inference is based on n independent measurements. B)

Which of the following is not a condition for performing inference about a population mean U ? A) Inference is based on n independent measurements. B) The population distribution is Normal or the sample size is large (say n > 30). C) The data are obtained from a SRS from the population of interest. D) The population standard deviation, ? , must be known .
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Maciej Morrow
option (D) is not required for making a hypothesis on population mean u D) The population standard deviation, ? , must be known .