Survey Bias occurs when people ruin the survey results by not answering truthfully but rather than choosing what’s socially acceptable.

For example, if you are asked how often you exercise, you may be tempted to say that you exercise every day, even if you only exercise a few times a week. Social desirability bias can impact the results of a survey by causing people to over-report positive behaviors and under-report negative behaviors.

This is why you should be careful when reading reports from surveys because they might not be what they portray.

Man answers survey to most socially accepted answer