Quantitative Research
Quantitative research is a systematic approach to studying questions using numerical data and statistical analysis. Researchers use it to measure variables, test hypotheses, examine relationships, identify patterns, and evaluate differences between groups.
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Common Research Types in Quantitative Research
Cleaning
Analysis
Main Types of Quantitative Research
Quantitative research includes several common designs, each suited to different types of research questions.
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Descriptive Research — Describes characteristics, trends, or patterns in a population.
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Correlational Research — Examines relationships between variables without manipulating them.
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Experimental Research — Tests cause-and-effect relationships by manipulating one or more variables.
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Quasi-Experimental Research — Examines potential causal effects when researchers cannot randomly assign participants.
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Causal-Comparative Research — Compares existing groups to investigate possible explanations for differences.
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Cross-Sectional Research — Collects data from participants at a particular point in time.
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Longitudinal Research — Collects data over an extended period to study changes and developments.
Quantitative vs. Qualitative Research
Quantitative and qualitative research use different approaches to investigate research questions. The key differences include the type of data collected, the purpose of the research, and how the data are analyzed.
Quantitative Research
Focuses on numerical data and statistical analysis to measure variables and test hypotheses.
Data type
Numerical data
Main purpose
Measure, test, and examine relationships
Typical questions
How much? How many? Is there a relationship?
Common methods
Surveys, experiments, tests, and structured measurements
Analysis
Statistical analysis
Qualitative Research
Focuses on non-numerical data to explore experiences, perspectives, and meanings.
Data type
Text, observations, images, and other non-numerical data
Main purpose
Explore experiences, perspectives, and meanings
Typical questions
How? Why? What is the experience?
Common methods
Interviews, focus groups, observation, and document analysis
Analysis
Thematic, content, or interpretive analysis
Examples of Quantitative Research Questions
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Does sleep duration correlate with academic performance?
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Does a new teaching method improve test scores?
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How does income vary across different demographic groups?
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What percentage of researchers use AI tools for literature reviews?
