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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