Division Formula 3

United Kingdom

S_{\bar{P_{{EI}_{i}}}} = \frac{S_{P_{{EI}_{i}}}}{\sqrt{n}} = \sqrt{\frac{\sum_{n}^{j = 1} {(P_{{EI}_{i_{j}}} - \bar{P_{{EI}_{i}}})}^{2}}{n (n - 1)}}

where:

Number of measurements of the sample, which is at least 5

The standard deviation of the power consumption of each efficient exterior LED light ( $S_{\bar{P_{{EI}_{i}}}}$ ) leads to an error in the CO₂ savings ( $S_{C_{{CO}_{2}}}$ ). This error is to be calculated by means of Formula 4

Formula 4