RESUMO
The aim of this paper is to assess the variability in the normality of the process going on at the upper atmosphere. As Sun is the major deriving force of our terrestrial system an investigation of its influence can be correlated by its activity like, solar flare. One of the sample of Solar Flare Duration [SFD] from [1972-2006] have been utilized for estimating its population parameter. Another two samples of low and high solar activity between an interval of [1984-85] and [1980-81 and 1986-87] respectively be used to compare the corresponding ozone column in Dobson Unit, so that influence of solar flare on ozone be assessed. For this purpose the concept of sampling distribution is utilized to find the nearest estimate of mean solar flare duration and respective ozone thickness from the population where it derived. The degree of confidence for different intervals with hypothesis testing has been set-up to access the accuracy of sample statistic. Finally the statistical conclusions have been achieved on the behavior of ozone in response of SFD