Gussing a value

Dear members,

I have used 2 sensors A & B to measure vascular flow. Sensor A is old and noisy, and I have measued 10 times by it. Sensor B is new and less noisy, and I have measured 4 times by it.
What is the best quess being near to the actual flow value based on my result?

I appreciate any help.

Best wishes

do you mean:
Sensor A standard deviation is bigger than Sensor B standard deviation, but there are only 4 observations for Sensor b.
And your question is, which sensor will give a better result in average?

Are both sensor not biased, will support a correct average result with a big sample size?
Do you know the standard deviation of the sensors?

The standard deviation of average is: standard deviation/sqrt(n)