Final answer:
The statement about informal surveys being extremely reliable is false. Surveys must be carefully designed to be both reliable and valid to provide trustworthy data, and their reliability can be influenced by many factors such as sampling methods and question wording.
Step-by-step explanation:
Informal surveys are not considered extremely reliable sources of information; therefore, the statement 'Are informal surveys statistically measurable and therefore an extremely reliable source of information?' is false. Informal surveys may not use rigorous scientific methods, may not be representative of the general population, and participants might not always provide accurate responses. Factors such as the wording of questions, the representativeness of the sample, and participants' willingness to give truthful responses can all affect the reliability of a survey.
A measurement is considered reliable when it yields consistent results under consistent conditions. Larger sample sizes are often better than smaller ones because they tend to more accurately represent the population, making the findings more generalizable. However, a measurement must also be valid, meaning that it actually measures what it is supposed to measure. Furthermore, while it is true that experiments can be conducted on humans, they must be designed with strict ethical considerations in mind.