Quick questions on Investigation evidence and data appraisal for QCE Health Unit 4

Reliability is about consistency: would the same method produce the same result if repeated? A reliable source uses sound methods, an adequate sample size and a transparent process. A small, self-selected survey or a one-off anecdote is low in reliability. When you cite data, comment on how reliable it is rather than presenting it as fact.

Validity is about accuracy and relevance: does the evidence actually measure what it claims to, and does it apply to your context? A national statistic may be valid for the country but less valid for a specific local cohort. A leading survey question produces invalid data because it measures the question's bias, not real views. Checking validity means asking whether the source is current, relevant to your population, and free of bias or vested interest.

The investigation is judged on analysis and a defensible conclusion. Use your appraised evidence to make a judgement against clear criteria, not a personal preference. Where sources conflict, explain which you trust more and why, referring to reliability and validity. Acknowledge the limitations of your evidence, such as a small sample or an out-of-date figure, because naming limitations honestly demonstrates the critical thinking the top band requires.