Question: Fifty people with sore backs are randomly divided into two groups. One Fiftypeoplewithsorebacksarerandomlydividedintotwogroups.One group is groupis treated weekly treatedweekly with laughing sessions withlaughingsessions and an

Fifty people with sore backs are randomly divided into two groups. One

Fiftypeoplewithsorebacksarerandomlydividedintotwogroups.One group is

groupis treated weekly

treatedweekly with laughing sessions

withlaughingsessions and an exercise regimen. The other is

andanexerciseregimen.Theotheris treated

treated weekly with

weeklywith exactly the same exercise regimen comma but no

exactlythesameexerciseregimen,butno laughing sessions.

laughingsessions. After oneyear, both groups are questioned about their sore backs.

questionedabouttheirsorebacks.

a. Identify the response variable and the explanatory variable.

b. Was this an observational study or anexperiment? Explain why.

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