Stats Part Last: All together!

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What is an Observational Study?

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An Observational Study is a type of research where the researcher observes and records behavior or outcomes without manipulating any variables. It is used to gather data in a natural setting.

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What is the definition of Population in statistics?

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Population refers to the entire group of individuals or instances about whom we hope to learn. For example, all teachers in Shenandoah County.

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What is a Sample Size?

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Sample Size is the number of observations or replicates included in a statistical sample. For example, in the New York Times Poll, the sample size was 1025.

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What is the difference between a Survey and an Observational Study?

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A Survey involves asking people questions to gather data, while an Observational Study involves watching and recording behaviors without direct interaction.

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What is Bias in data collection?

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Bias refers to systematic errors that lead to incorrect conclusions. It can occur if the sample is not representative of the population.

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What is a Random Sample?

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A Random Sample is a subset of individuals chosen from a larger set, where each individual has an equal chance of being selected.

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What is the purpose of a Control Group in an Experimental Study?

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A Control Group is used as a benchmark to measure how the other tested subjects do. It helps to isolate the effect of the variable being tested.

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What is a Variable in research?

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A Variable is any factor, trait, or condition that can exist in differing amounts or types. In experiments, variables are manipulated to observe effects.

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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 values and can be measured.

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What is a Hypothesis?

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A Hypothesis is a testable prediction about the relationship between two or more variables.