R language Visual facet chart, hypothesis test, multivariable grouping t-test, visual multivariable grouping faceting bar plot, adding significance level and jitter points

R Language visualization facet 、 Hypothesis testing 、 Multivariable grouping t test 、 Visual multivariable grouping faceted bar graph （faceting bar plot） And add significance level 、 Add jitter data point （jitter points）

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