I have plotted time-series data on estimates of pollutant emissions superimposed with standard errors of the means. See the figure below. In reality, quantities of emissions should be non-negative. However, the data I presented here were calculated from different data sources. So in the figure, the means are all non-negative, however, when superimposed with standard errors, the lower bounds of SE before 1950 might become negative, which is unreal and indicates that there is a possibility that the emissions did not happen. So I just want to understand the possibility of no emissions, can I say that
- before 1915, the possibility of no emissions is nearly 50%.
- from 1915 to 1950, the possibility of no emissions is at least 15.8% and at most 50%.
- from 1950 onwards, the possibility of having pollutant emissions is at least 84.2%, and conclude that this period is significantly different from the period pre-1950 because the lower bounds are above zero which is unreal.