Subjects' self-reports often indicate that they are healthier, happier, and less prejudiced than other types of evidence would suggest. The most likely explanation is

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The phenomenon described is known as social desirability bias, which is the tendency for people to present themselves in a positive light, especially when responding to surveys or other forms of self-report. This bias can result in responses that are more positive than reality, leading to a discrepancy between self-reported and actual behaviors or attitudes. Experimenter bias and faulty memory are not likely to produce this particular pattern of results, and there is no indication that the subjects have a tendency to agree with almost every statement.

Subjects' Self-Reports Often Indicate That They Are Healthier, Happier, and Less