To Investigate the Effects of a New Drug for Hyperactivity

question 23

Multiple Choice

To investigate the effects of a new drug for hyperactivity, one group of children is given this new drug, while the other group is given a placebo. The experimenter has his assistant label the drug and the placebo with letter names so that he will not know which group of children is getting the placebo and which group is getting the new drug until the end of the experiment. This researcher is using a

• A)double-blind experiment to minimize research participant bias and researcher bias.
• B)single-blind experiment to minimize observer bias and the observer effect.
• C)triple-blind experiment that incorporates random selection and random assignment.
• D)placebo effect to maximize the self-fulfilling prophecy.

---

Definitions:

Kingpin Bushings

Components that provide a bearing surface for the kingpin in truck and trailer steering mechanisms, allowing for smooth pivoting.

Broached

A machining process that uses a toothed tool to remove material, typically used for making unique shapes or holes in metal.

Steering Defects

Flaws or failures in the steering mechanism of a vehicle, which can affect handling and safety, often requiring immediate correction or repair.

OOS

OOS stands for Out of Service, a designation that indicates a vehicle or driver has been found to have violations that prevent them from operating until corrected.