In the Formula $\bar { x } \pm z _ { \alpha / 2 } ( ?/ \sqrt { n } )$

question 123

Multiple Choice

In the formula $\bar { x } \pm z _ { \alpha / 2 } ( ?/ \sqrt { n } )$
,the subscript $( \alpha / 2 )$ refers to the:

• A) probability that the confidence interval will contain the population mean.
• B) probability that the confidence interval will not contain the population mean.
• C) area in the lower tail or upper tail of the sampling distribution of the sample mean.
• D) level of confidence.
• E) sampling error.

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