Students in a large statistics class were randomly divided into two groups. The
ID: 3067600 • Letter: S
Question
Students in a large statistics class were randomly divided into two groups. The first group took the midterm exam in a room painted in pale green while the second group took the exam in room painted bright yellow. The exam scores of the two groups were then compared. This experiment was not blind because: O students were allowed to keep their eyes open while taking the exam the students knew which color the room in which they took the exam was pained. Question 6 of 7 To test an herbal treatment for headaches, 100 volunteers who suffered from mild headaches were randomly dvided into two groups, Each one group, the tea contained the herb mixed with green tea, whereas for the other group, the bags were asked to drink one cup of tea per day for a month. person was given a month's supply of tea bags For contained only the green tea. Participants were not told which type of cea they had, and At the end of the month, a researcher evalusted them to determine if the lergth and number of headaches had improved. The researcher did not know which of the subjects had the tea wit the herbal ingredient added. Which is true regarding this study? O A This study is double-blind. O C This study is an observational study.Explanation / Answer
In a blind experiment subjects do not know anything about there treatment type. Here subjects know the room color. So it is not blind.
Last option is correct.
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Here researcher and patients both do not know which treatment is given to which subject so it is double bind experiment.
The control group is "only green tea" and treatment group is "green tea with added herbs".
Hence, correct options are A and B.