Which of the Following Assumptions Must Be True in Order $$\bar { X } \pm z _ { a/2 } ( \sigma / \sqrt { n } )$$

question 26

Multiple Choice

Which of the following assumptions must be true in order to use the formula $$\bar { X } \pm z _ { a/2 } ( \sigma / \sqrt { n } )$$ 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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