Determine whether the study described is a randomized experiment or an observational study.
a wellness instructor wants to determine the effect of fitness class types on body fat composition. she selects four fitness classes that are currently in session: yoga, zumba, pilates, and tae bo. she measures the body fat of the fitness class participants at that time and then again during the last week of classes.

observational study

Explanation:

an observational study is a sample survey of a population whereby a sample of the population is used to make inference and the independent variable is out of the control of the researcher. Unlike the case of randomized experiments where subjects could be assigned randomly to groups, the researcher has no control over variables as he draws sample directly from population. There are three types of observational study:cross-sectional studies, case-control studies, and cohort studies.

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explanation:

the economic difference between the three colonial regions. shipbuilding, whaling, fishing, and trapping where also main factors to the economy. the southern regional colonies economy was based on sugarcane, rice, cotton, tobacco, and indigo.