# Estimate standard error due to reduction in sampling rate for a time series data

I have a large set of time series data representing the progression of a variable during an industrial production process collecting at a certain frequency at regular intervals. The mean of each curve was also calculated as well

Is it possible to estimate change in the standard error of the mean if the sampling rate is reduced?

How should one go about comparing the changes in the mean due to the reduction in the sampling rate?

(From a person that is good with math but extremely bad with statistics)