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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Definitions:

Referral

A recommendation from one individual to another about a job, service, or product. In a workplace context, it often relates to suggesting someone for a job position.

Return On Investment

A financial metric used to evaluate the efficiency or profitability of an investment, calculated by dividing the profit gained from an investment by its cost.

Yield Ratio

A ratio that expresses the percentage of applicants who successfully move from one stage of the recruitment and selection process to the next.

Cost Per Hire

The total expenses incurred by an organization to fill a job vacancy, including advertising, recruiting, and administrative costs, divided by the total number of hires made.