To test an herbal treatment for depression, 100 volunteers who suffered from mild depression were randomly divided into two groups. Each person was given a month's supply of tea bags. For one group, the tea contained the herb mixed with spice tea, whereas for the other group, the bags contained only the spice tea. Participants were not told which type of tea they had, and were asked to drink one cup of tea per day for a month. At the end of the month, a psychologist evaluated them to determine if their mood had improved. The psychologist did not know which of the subjects had the tea with the herbal ingredient added.Which of the following statements is true regarding this study? Check all that apply. This study is an observational study. This study is double-blind. The "only spice tea" group serves as the control group.
Question
To test an herbal treatment for depression, 100 volunteers who suffered from mild depression were randomly divided into two groups. Each person was given a month's supply of tea bags. For one group, the tea contained the herb mixed with spice tea, whereas for the other group, the bags contained only the spice tea. Participants were not told which type of tea they had, and were asked to drink one cup of tea per day for a month. At the end of the month, a psychologist evaluated them to determine if their mood had improved. The psychologist did not know which of the subjects had the tea with the herbal ingredient added.Which of the following statements is true regarding this study? Check all that apply. This study is an observational study. This study is double-blind. The "only spice tea" group serves as the control group.
Solution
The statements that are true regarding this study are:
- This study is not an observational study. It is an experimental study because the researchers are actively manipulating the variable (the type of tea) and observing the effect on the participants' mood.
- This study is double-blind. This means that neither the participants nor the psychologist evaluating the results know which group received the herbal tea. This helps to prevent bias in the results.
- The "only spice tea" group serves as the control group. This group is used to compare against the group that received the herbal tea to see if there is a significant difference in mood improvement.
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