At a non-towered airport, is two-way radio communication required before operating in the vicinity of the traffic pattern?

Why: The FAA study guide states: "A non-towered airport does not have an operating control tower. Two-way radio communications are not required, although it is a good operating practice for pilots to monitor other aircraft on the specified frequency for the benefit of other traffic in the area."

• Invents a blanket two-way-radio requirement; no such requirement exists at non-towered airports under the source text.
• Confuses the presence of a UNICOM station with a mandatory communication requirement; having a UNICOM doesn't create a requirement to use it.