Which of the Following Assumptions Must Be True in Order $\bar { x } \pm z _ { \mathfrak { w } / 2 } \sigma / \sqrt { n }$

question 66

Multiple Choice

Which of the following assumptions must be true in order to use the formula $\bar { x } \pm z _ { \mathfrak { w } / 2 } \sigma / \sqrt { n }$ to find a confidence interval estimate of the population mean?

• A) The population variance is known.
• B) The population mean is known.
• C) The population is normally distributed.
• D) The confidence level is greater than 90%.

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