**Question:** In a community of 3000 people, 80% are Hindus, 10% Muslims, 5% Sikhs, 4% Christians and 1% Jains. To select a sample of 300 people to analyze food habits, the ideal sample would be -

A. Chose 300 people randomly
B. Select the first person randomly and then select the next person if their religion is different from the previous person
C. Select the first person randomly and then select the next person if their religion is the same as the previous person
D. Select the first person randomly and then select the next person if they are from a different caste than the previous person

**Correct Answer:** C. Select the first person randomly and then select the next person if their religion is the same as the previous person.

**Core Concept:**

The correct method for selecting a sample in a diverse community involves ensuring that the sample accurately reflects the population's composition. In this case, the population consists of 80% Hindus, 10% Muslims, 5% Sikhs, 4% Christians, and 1% Jains.

**Why the Correct Answer is Right:**

The correct method (Option C) ensures that the sample is representative of the population by gradually increasing the proportion of people from each religious group. This is done by selecting a person randomly and then selecting the next person if their religion is the same as the previous person. This process continues until 300 people are selected, which ensures that the sample's composition closely mirrors the population's religious distribution.

**Why Each Wrong Option is Incorrect:**

A. Chosing 300 people randomly (Option A) would not guarantee that the composition of the sample accurately represents the population. The sample could include too few people from certain religious groups, skewing the results.

B. Selecting the next person if their religion is different from the previous person (Option B) would still not accurately represent the population, as too many people from some religious groups might be included, leading to an inaccurate representation of the community.

D. Selecting the next person if they belong to a different caste than the previous person (Option D) is irrelevant to the task of sampling based on religious distribution. Castes are a different social stratification system in India and do not directly correlate with the religious groups mentioned in the question.

**Clinical Pearls and Challenges:**

1. Understanding the population's composition is crucial when planning a sample for research or surveys, as it ensures the results are representative and applicable to the overall population.
2. In multi-ethnic or multi-religious communities, choosing participants based on additional criteria (e.g., caste) may lead to inaccurate results as the study might not capture the full spectrum of individuals within the target population.
3. In this scenario, religious groups are the primary criteria for sampling, so focusing on caste would not be appropriate or relevant to the research goal.

4. To ensure a diverse sample, the selection should follow the population's religious distribution, as represented by the correct answer (Option C).

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