A researcher published this survey result: "74% of people would be willing to spend 10 percent more for energy from a non-polluting source". The survey question was announced on a national radio show...

1. A researcher published this survey result:
   "74% of people would be willing to spend 10 percent more for energy from a non-polluting source".
   The survey question was announced on a national radio show and 1200 listeners responded by calling in.

Determine whether the study involves selection bias, participation bias, both selection bias

 and participation bias, or neither. Also describe how the bias would affect the results.