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In any measurement it is not obtain a real valour

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It is obtain an interval where is the real data

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It is supposed any systematic error

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Valour range that it is obtain when it is add and subtract to the arithmetic mean (x ̅) the confidence interval

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The interval where it is expected to find the real valour with 90%, 95% or 99% confidence level

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Mean ± Confidence Interval

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How it is determined the Confidence Interval?

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If we haves, it could be used the z that it was studied the previous activity

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If we don’t have s, we need another mathematical expression

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Tabulated valour, it depends of the Confidence Interval and the degrees of freedom(n-1) related with a measurement set

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Distribution similar to Normal distribution but some width

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When it is increased the measurement data the width is less

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With a large measurement data it will be obtain the Normal Distribution