Sampling Methods

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What is Random Sampling?

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A sampling method where each member of a population has an equal chance of being selected. Example: Drawing names from a bag.

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What is Voluntary Sampling?

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A sampling method where participants choose to be part of the sample. Example: Alumni responding to a survey about their salaries.

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What is Systematic Sampling?

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A sampling method where members are selected at regular intervals. Example: Every fifth person boarding a plane is searched.

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What is Convenience Sampling?

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A sampling method where samples are taken from a group that is easily accessible. Example: Surveying shoppers as they leave a mall.

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What is the main purpose of Sampling Methods?

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To select a subset of individuals from a population to estimate characteristics of the whole population.

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What is the difference between Random and Convenience Sampling?

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Random sampling gives every individual an equal chance of selection, while convenience sampling selects individuals who are easiest to reach.

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What are the advantages of Random Sampling?

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It reduces bias and allows for generalization of results to the larger population.

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What are the disadvantages of Convenience Sampling?

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It may lead to biased results as it does not represent the entire population.

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What is an example of a situation where Systematic Sampling is used?

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Quality control inspections where every nth item is checked for quality.

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How does Voluntary Sampling affect survey results?

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It may lead to biased results as only those with strong opinions are likely to respond.