A group of 60 volunteers who do not regularly exercise are randomly assigned to one of two fitness programs.  One group of 30 is enrolled in a daily walking program, and the other group is put into a jogging program.  After a period of 6 weeks, the two groups are compared based on their scores on a wellness index.   What kind of a study is this? (Observational or experimental)     If the study shows that the joggers score better than the walkers, is this association of cause-and-effect?  Why?

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