WILL MEDAL AND FAN PLZ HELP
Which of these actions might help to reduce bias in a scientific investigation?
A.telling the person before the investigation what outcome to expect
B.telling the person before the investigation to report only significant observations
C.the person doing the investigation recording all conditions before, during, and after the investigation
D.asking the person before the investigation what outcome they expect
Stacey Warren - Expert brainly.com
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When you observe everything that is happening there isn't much room for error. You are seeing all the conditions that may have affected the outcome of an experiment.
For a: If you tell the person what to expect they'll be looking for it.
For b: What's important may differ from person to person
For c: They are recording everything that's happening no matter how unimportant
For d: by asking them what they expect they'll be more likely to look for that in specific.
I think it's C