Domestic violence does not discriminate on the basis of age. There has been a increased number of domestic violence cases in teen relationships though. but people of all ages and races are victims of domestic violence everyday.
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Population pyramids
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.
792 different groups of 5 books, in 95,040 different sequences.
Circle graphs, or pie charts compare the percentage of different things.
It measures things between different groups, for example, a sandwich is a things, but you can use a bar graph to measure different kinds of sandwiches.