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To determine her blood pressure, Carolyn divides up her day into three parts: moming, aftemoon, and evening. She then measures her blood pressure at 3 randomly selected times during each part of the day. What type of sampling is used? A. Cluster B. Systematic C. Stratified D. Convenience E. Simple random

Ask by Huff Cox. in the United States
Jan 22,2025

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Answer

The sampling method used is **Stratified**.

Solution

To determine the type of sampling used in Carolyn's method of measuring blood pressure, let's analyze the situation: 1. **Dividing the day into parts**: Carolyn divides her day into three distinct parts: morning, afternoon, and evening. This indicates that she is considering different segments of the population (in this case, different times of the day). 2. **Measuring at random times**: She then measures her blood pressure at 3 randomly selected times during each part of the day. This means that within each segment (morning, afternoon, evening), she is selecting times randomly. Based on this analysis, the sampling method used is **C. Stratified** sampling. This is because she is dividing the population (the day) into strata (the three parts of the day) and then taking random samples from each stratum. Thus, the correct answer is **C. Stratified**.

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Bonus Knowledge

What Carolyn is using in her method is a combination of stratifying her day into three distinct parts and then randomly selecting times within each part to measure her blood pressure. This allows her to ensure that each segment of the day is represented in her data collection, enhancing the reliability of her findings! In real-world applications, stratified sampling is often used in surveys or studies to ensure that various subgroups within a population are adequately represented. For example, when conducting market research, companies may stratify their customers by age or income level. This makes sure that the feedback gathered reflects the opinions of all segments, leading to better-informed decision-making!

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