Question: Ashley was running a two-sample dependent hypothesis test for the mean to determine whether or not people's exercise levels (in minutes per week) had severely

Ashley was running a two-sample dependent hypothesis test for the mean to determine whether or not people's exercise levels (in minutes per week) had severely changed since the beginning of the COVID-19 quarantine. In her test value formula: , t_test=(x _D-_D)/(s_d/(n_D )), Ashley set: _D=0. Why?

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