In the study that relates to the increased computed tomography (CT) various statistical techniques are applied, which include descriptive statistics, analysis of variance. The study calculated descriptive statistics for effective doses for all the CT examinations types. Moreover, the ANOVA test is also used to find out the differences across and within institutions for the study types. In addition to this, log transformation was also applied to the variable in order to make the data normal and to satisfy the assumption of normally distribution for ANOVA test. Analysis of variance (ANOVA) is based on the ...