Question

a properly conducted experiment includes which of the following? multiple choice participants who know which variable group of the experiment they are part of observations that require a scientist to modify or abandon the hypothesis experimental bias the impossibility of being false experimenters who know which participants are in which groups

Explanation:

• For the first option: In proper experiments (especially with blinding), participants not knowing their group is better to avoid bias, so this is incorrect.
• Second option: Good experiments involve observing results and modifying/abandoning hypotheses if data doesn't support them, as science is iterative and based on evidence.
• Third option: Experimental bias is a flaw, so a properly conducted experiment avoids it, not includes it.
• Fourth option: Scientific findings are tentative; no result is "impossible to be false" as new evidence can emerge, so this is wrong.
• Fifth option: In proper experiments (like double - blind), experimenters not knowing groups reduces bias, so this is incorrect.

Answer:

B. Observations that require a scientist to modify or abandon the hypothesis