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Which was stratified?

You have been provided two DataFrames, df_1 and df_2. You can inspect them in the console. They contain the columns, 'salary', 'free_hours', and 'high_free_time' as well as two additional columns: 'Block' is which experimental block they have been allocated to, and 'T_C' is whether they have been allocated to treatment or control.

Which DataFrame is stratified with respect to the 'high_free_time' column?

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Both df_1 and df_2

df_1

df_2

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