Final answer:
The NHS survey may be considered unreliable due to factors such as inaccurate responses and poor survey design. It is not safe to make whole policy changes based solely on the NHS survey.
Step-by-step explanation:
The NHS survey may be considered unreliable for several reasons. One reason is that respondents may not have enough knowledge on the topic but are unwilling to admit it, leading to inaccurate responses. Another reason is that people may not always give honest answers, either intentionally lying or wanting to portray themselves in a positive light. Additionally, poor survey design and polling methods can also contribute to inaccurate results.
It is not safe to make whole policy changes based solely on the NHS survey because of its potential for unreliability. Policy decisions should ideally be based on a comprehensive and balanced analysis of multiple sources of evidence, including other research studies, expert opinions, and public consultations. Relying on a single survey, especially if it has limitations or flaws, may lead to unfair or ineffective policies.