A researcher is studying the relationship between sugar consumption and weight gain. Twelve volunteers were randomly assigned to

Question

A researcher is studying the relationship between sugar consumption and weight gain. Twelve volunteers were randomly assigned to one of two groups. The first group of five participants was put on a diet low in sugar and the second group of the remaining seven participants received 10% of their calories from sugar. After 8 weeks, weight gain was recorded from each participant. What type of study is this? 
A double-blind experiment. 
 An observational study. 
 A matched pairs experiment.
  An experiment, but not a double-blind experiment.

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