Use the Margin of Error, Confidence Level, and Standard Deviation $25.4$

question 123

Multiple Choice

Use the margin of error, confidence level, and standard deviation ? to find the minimum sample size required to estimate an unknown population mean µ
-A group of 51 randomly selected students have a mean score of $25.4$ with a standard deviation of $3.1$ on a placement test. What is the 90 percent confidence interval for the mean score, $\mu$ , of all students taking the test?

• A) \(24.3 < \mu < 26.5\)
• B) \(24.4 < \mu < 26.4\)
• C) \(24.7 < \mu < 26.1\)
• D) \(24.5 < \mu < 26.3\)

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