Question

safety ____ are placed on containers to communicate about health, flammability, and ignitability hazards.
posters
labels
msds
hazmat signs

1. choose all that apply.

which two are ways scientists can reduce bias in their research?
only work with their friends.
make sure the experiment is repeatable.
only use the most expensive equipment.
only do the experiment once but perfectly.
remain transparent.

Explanation:

• Safety labels: They are placed on containers to communicate health, flammability, and ignitability hazards. Posters are usually larger and more for general awareness in a space, not specifically on containers. MSDS (Material Safety Data Sheets) are documents, not something placed on containers. Hazmat signs are more about indicating hazardous materials in a general sense (like on trucks), but labels are specific to the container.
• Reducing bias in research:
• Making the experiment repeatable: If an experiment can be repeated by others (or the same scientist), it allows for verification. If only friends work together, there could be social biases. Using only expensive equipment doesn't relate to bias reduction. Doing an experiment only once (even perfectly) doesn't account for random errors or biases that might be revealed in repetition.
• Remaining transparent: Transparency in methods, data collection, etc., allows others to check for biases.

Answer:

1. B. labels
2. Make sure the experiment is repeatable; Remain transparent.