Biostatistics is used to determine how diseases develop progress and spread for example biostatisticians use statistics to predict the behavior of an illness like the flu its used to help predict the mortality rate the symptoms and even the time of year people might get it source csiro . In biostatistics when comparing the means of two independent groups of subjects using an unpaired student t test the effect size is expressed as the ratio of delta the difference between the means of two groups divided by sigma the within group standard deviation. Biostatistics analysis has long worked with hospitals government agencies academic and research institutions and private corporations on the biostatistical and medical analysis or statistical interpretation of biomedical testing our tutors are highly efficient in teaching the use and application of biostatistics software on the robust