Determine whether each of the following studies described is observational or an experiment. If the study is an experiment, identify the control and treatment groups, and disucss whether single-or double-blinding is necessary. If the study  is observational, state whether it is a retrospective study, and if so, identify the cases and controls.  A National Cancer Institute study of 716 melanoma patients and 1014 cancer-free patients matched by age, sex, and race found that those having a single large mole had twice the risk of melanoma. Having 10 or more moles was associated wiht a 12 times greater risk of melanoma.

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