Types of Studies and Sampling Methods

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What is a Prospective Study?

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A study that follows participants forward in time to observe outcomes, often used to assess the effects of certain variables.

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What is a Retrospective Study?

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A study that looks back at events that have already occurred, often using existing records to find correlations or outcomes.

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What does IQR stand for in statistics?

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Interquartile Range, a measure of statistical dispersion that represents the range between the first and third quartiles.

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What does a correlation coefficient of -0.93 indicate?

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It indicates a strong negative correlation between two variables.

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What is a Randomized Experiment?

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An experiment where participants are randomly assigned to different groups to test the effects of a variable.

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What is a Survey in research?

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A method of collecting data by asking people questions, often used to gather opinions or self-reported behaviors.

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What is Conditional Distribution?

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The distribution of a subset of data, conditioned on a specific criterion or event.

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What is the purpose of using box-plots?

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To visually display the distribution of data based on a five-number summary: minimum, first quartile, median, third quartile, and maximum.

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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 represents numerical values.

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What is the significance of a strong positive correlation?

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It indicates that as one variable increases, the other variable also tends to increase.