In Constructing a Confidence Interval for the Population Mean When $$\bar { X } \pm t _ { a n , n - 1 } ( s / \sqrt { n } )$$

question 58

Multiple Choice

In constructing a confidence interval for the population mean when the population variance is unknown, which of the following assumptions is required when using the following formula? $$\bar { X } \pm t _ { a n , n - 1 } ( s / \sqrt { n } )$$

• A)The sample size is greater than 30.
• B)The population variance is known.
• C)The population is normal.
• D)The sample is drawn from a positively skewed distribution.

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