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What is a controlled experiment?

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A controlled experiment is a scientific test where one variable is changed while all others are kept constant to determine the effect of that variable.

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What is an observational study?

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An observational study is a research method where the researcher observes and records behavior without manipulating any variables.

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What percentage of Americans have type O blood according to the study?

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45% of Americans have type O blood.

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What is the best method for gathering a sample in a survey?

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The best method is to survey a random sample of individuals to ensure unbiased results.

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What is a sample survey?

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A sample survey is a study that collects data from a subset of a population to infer conclusions about the entire population.

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What is the margin of error in statistics?

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The margin of error is a measure of the uncertainty in survey results, indicating how much the results may differ from the true population value.

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What is the purpose of random sampling?

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Random sampling aims to select individuals from a population in such a way that every individual has an equal chance of being chosen, reducing bias.

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What is the difference between qualitative and quantitative data?

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Qualitative data describes characteristics or qualities, while quantitative data involves numerical measurements.

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What is a census?

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A census is a complete count of a population, collecting data from every individual.

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What is the significance of sample size in surveys?

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Larger sample sizes generally lead to more accurate and reliable results, reducing the margin of error.