I am recording data in real time, my signal has a stability period and then a relatively stable period (with noise, red) outlined in the image. I am require to repeat this type of measurement N times (lets say 10 times) and between each measurement the signal must be switched off and turn back on again, hence 10 stability periods.
My question is, how should the average value and associated error be reported?
I believe I should be evaluating the mean value (between the red lines) for each of the 10 repeats. Here the standard deviation would reflect the noise.
To then consider the 10 repeat measurements I take the average of these mean values, but i don't understand how the errors propagate, this obviously isn't the SD on these mean values.