Question 286871
You might try a box plot on each of the data sets.
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You could run a t-test on the (before-after) data.
using Ho: u(difference) = 0 
Ha: u(difference) is not zero.
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These data pairs are dependent because each
pair is a before/after measure for a person.
So, do not use a 2-sample t-test; do not ues
a 2-sample z-test.
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Cheers,
Stan H.