The correct answer is D. Time Series Data Collection.
Time series data collection is a method of collecting data at regular intervals over a period of time. This data can be used to track trends, identify patterns, and make predictions. Time series data collection is often used in business, finance, and economics.
Observational studies are a type of research in which the researcher does not control the variables being studied. Instead, the researcher observes the variables as they occur naturally. Observational studies can be used to study a wide range of topics, including human behavior, social interactions, and natural phenomena.
Experiments are a type of research in which the researcher controls the variables being studied. This allows the researcher to determine the
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