Standard Deviation A calculation to show the spread of results around a mean. The purpose is to show if experimental results have anomalies and if valid conclusions can be drawn Gain your results Add them up and divide by the sample number= mean x̄ For each result, take it away from the mean x-x̄ Square the differences (x-µ)² Calculate the mean of the differences=variance Square root the variance to give standard deviation Sample N (14) Heart Rate BPM (x) x̄-x (x̄-x)² Becky 75 0 0 Caroline 78 3 9 Mary 84 9 81 Anne 69 -6 36 Fran 75 0 0 Yasmie 81 6 25 Mo 81 6 25 Clare 70 -5 36 Kerala 81 6 25 Saki 84 9 81 Emma 63 -12 144 Vicky 69 -6 36 Amy 72 -3 9 Nicole 63 -12 144
Standard DeviationA calculation to show the spread of results
around a mean. The purpose is to show if experimental results have
anomalies and if valid conclusions can be drawn
Gain your results Add them up and divide by the sample number=
mean x For each result, take it away from the mean x-x Square the
differences (x-) Calculate the mean of the differences=variance
Square root the variance to give standard deviationSample N
(14)Heart Rate BPM (x)x-x(x-x)
