In random sampling chance of being picked up is-
**Core Concept**
The underlying principle being tested is the concept of **probability** in **epidemiology** and **biostatistics**, specifically in the context of **random sampling**. This involves understanding how samples are selected from a population to ensure **representativeness**.
**Why the Correct Answer is Right**
In **random sampling**, every member of the population has an **equal chance** of being selected. This method is crucial for minimizing **bias** and ensuring that the sample is **representative** of the population. The chance of being picked up in random sampling is **equal for all members**.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify the nature of the chance, which is a critical aspect of random sampling.
**Option B:** This option is also incorrect as it implies a varying chance, which contradicts the principle of random sampling.
**Option C:** Similarly, this option is incorrect because it suggests an unequal chance, which is not a characteristic of true random sampling.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that **random sampling** is essential for **validating research findings** because it helps in reducing **selection bias**. Ensuring every member of the population has an equal chance of being selected is vital for the **generalizability** of study results.
**Correct Answer:** Correct Answer: D. Equal.