# Margin of error: 0.25 sec, confidence level: 99%, σ = 5.40sec. The minimum sample size required to estimate an unknown population mean μ?

**QUESTION:**

Margin of error: 0.25 sec, confidence level: 99%, σ = 5.40sec.

The minimum sample size required to estimate an unknown population mean μ?

* ANSWER*:

Given margin of Error (E) = 0.25

σ = 5.40

Confidence level: 99%, From the normal table values we get Zα_{/2} =2.575.

Sample size:

= (2.575)^{2} × (21.6)^{2}

= 3094.

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