In the Formula $$\bar { X } \pm z _ { a/2 } ( \sigma / \sqrt { n } )$$

question 45

Multiple Choice

In the formula $$\bar { X } \pm z _ { a/2 } ( \sigma / \sqrt { n } )$$ , the ?/2 refers to:

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

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