Combine the data from the separate therapies in Exercise 3.7 into a single data set, and construct a relative frequency histogram for this combined data set. Does the plot indicate that the data are from two separate populations? Explain your answer.
In exercise

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Standard Therapy New Therupy 4 15 24 10 27 31 5 20 29 7 32 36 14 2 16 32 7 13 36 17 15 19 35 10 16 39 29 6 12 18 14 15 18 27 14 10 16 1 13 16 6 13 2 20 8 324 98 33 30 29 3 27