Circle graphs, or pie charts compare the percentage of different things.
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It is a visual display used to compare the amount or frequency of occurrence of different characteristics of data and it is used to compare groups of data.
Both graphs are used to summarize data. Pareto chart is used to establish differences between different groups of data and will assign relative importance to the different groups of data. Histogram is a data distribution graph that will determine if the particular set of data is symmetric or not.
Bar Charts are used to compare things between different groups or tracking the changes according to time.
A t-test is an assessment of whether the means of two groups are statistically different from one another (running a t-test is appropriate when you want to compare the means of two groups). A t-test tell you the probability that those two sets of values come from different groups.
t-test