Final answer:
To improve the quality of the results in experimental design, scientists can take actions such as random assignment, having a control group, blinding, and gathering enough data.
Step-by-step explanation:
When developing an experimental design, there are several actions a scientist can take to improve the quality of the results:
Random assignment: Subjects should be assigned randomly to different treatment groups to eliminate lurking variables.
Control group: One group should act as a control group, receiving a placebo treatment that looks exactly like the active treatment but cannot influence the response variable.
Blinding: Both researchers and subjects may be blinded to preserve the integrity of the placebo.
Enough data: Gathering enough data to compare the experimental group and control group allows for better analysis and conclusions.