Type of Study. Determine whether the following studies are observational studies or experiments. If the study is an experiment, identify the control and treatment groups, and discuss whether single-or double-blinding is necessary. If the study is observational, state whether it is a case-control study, and if so, identify the cases and controls.
Using a survey of 35,000 Americans, the Pew Forum on Religion and Public Life determined that between 47 and 59 percent of adults switch their religions affiliation at least once in their lives.
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