Understanding Sampling in Research

The video tutorial explains the concept of sampling in research, highlighting its importance in obtaining data from a subset of a larger population. It covers various sampling methods, including probability and non-probability sampling, and provides real-world examples such as presidential polls and market research. The tutorial also discusses the reasons for sampling, key definitions, and potential sources of errors, offering strategies to minimize these errors.

What is the primary purpose of sampling in research?

• To make inferences about a population

• To reduce the cost of research

• To eliminate the need for data collection

• To increase the sample size

Which of the following is a characteristic of a good sample?

• It is representative of the population

• It is difficult to obtain

• It is always larger than the population

• It is biased

What is the main goal of using random sampling?

• To ensure a large sample size

• To eliminate all biases

• To ensure that every individual has an equal chance of being selected

• To select only the best samples

Which of the following is a common source of error in sampling?

• Data collection

• Measurement error

• Sample size

• Random selection

What is the main purpose of using a control group in an experiment?

• To increase the sample size

• To ensure the experiment is fair

• To reduce the cost of the experiment

• To provide a standard for comparison

What is the primary goal of random sampling?

• To increase the sample size

• To ensure that the sample is biased

• To ensure that the sample is representative of the population

• To reduce the cost of data collection

Which of the following is a common method used to select a sample?

• Random sampling

• Systematic sampling

• Stratified sampling

• All of the above

What is the main purpose of using a control group in an experiment?

• To ensure that the sample is random

• To ensure that the sample is representative

• To reduce the impact of confounding variables

• To increase the sample size

Which of the following is a common method used to select a sample?

• Stratified sampling

• All of the above

• Systematic sampling

• Random sampling

What is the primary goal of sampling in research?

• To reduce the cost of data collection

• To increase the accuracy of data

• To make inferences about a population

• To ensure that the sample is representative