Oddly Wired
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false consensus

You assume other people agree with your personal views.

Ross, Greene, and House (1977) found that participants who agreed to walk around with a 'Repent' sign believed approximately 63.5% of their peers would do the same.

Change 60% to 63.5%.

Your assumption of common ground is usually just a reflection of your own thoughts.

Where this comes from

Study
Ross, Greene, and House (1977)
What the check found
The study is a seminal work on the false consensus effect, but the statistic provided is a rounded approximation of the original data.
Confidence
Solid, with limits
false consensussocial dynamicsperspectivepsychology

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.