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

question 75

Multiple Choice

In the formula $\bar { x } \pm z _ { a / 2 } \sigma / \sqrt { n }$ , the $\alpha$ / 2 refers to:

• A)the probability that the sample mean will not equal the population mean.
• B)the probability that the confidence interval will not contain the population mean.
• C)the level of confidence.
• D)None of these choices.

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