The Formula for a 100(1 - α)% Confidence Interval for the Mean

question 17

Multiple Choice

The formula for a 100(1 - α) % confidence interval for the mean μ when the population standard deviation is unknown is ________.

• A)\(x_{i}-\bar{x} /(\sigma / \sqrt{n})\)
• B)\(\bar{x} \pm t_{\alpha} / 2 n-1(s / \sqrt{n})\)
• C)\(\bar{x} \pm_{z} \alpha / 2(\sigma / \sqrt{n})\)
• D)\(-\frac{(\sigma / \sqrt{n})}{z \alpha / 2}\)

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