For 95% confidence limits true is :
**Core Concept**
The question pertains to the understanding of confidence intervals, specifically the 95% confidence limits, which are a fundamental concept in **biostatistics** and **epidemiology**. This concept is crucial for interpreting the results of medical studies and understanding the reliability of estimates.
**Why the Correct Answer is Right**
Given the nature of the question, it seems to be inquiring about the characteristics or the formula associated with 95% confidence limits. Typically, a 95% confidence interval implies that if the study were repeated multiple times, 95% of the intervals would contain the true population parameter. This is related to the **standard error** and the **z-score** corresponding to 95% confidence, usually 1.96.
**Why Each Wrong Option is Incorrect**
**Option A:** Without specific details on option A, it's challenging to provide a precise reason for its incorrectness. However, if it doesn't align with the formula or interpretation of 95% confidence limits, it would be incorrect.
**Option B:** Similarly, without specifics, if option B does not correctly represent the concept or calculation of 95% confidence intervals, it is not the correct choice.
**Option C:** If option C misrepresents the z-score, standard error, or any other critical component of calculating 95% confidence limits, it would be an incorrect choice.
**Option D:** Assuming option D is the correct answer and the others are not, the specifics of why the other options are wrong would depend on their content not matching the criteria for 95% confidence limits.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that 95% confidence intervals do not imply that the population parameter has a 95% chance of being within the interval; rather, it suggests that if the same study were repeated many times, the resulting confidence intervals would contain the true parameter 95% of the time. This distinction is crucial for accurate interpretation of medical research findings.
**Correct Answer:** Correct Answer: D. 1.96