Quantitative Research Designs: Experimental
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چکیده
The ideas used in experiments today were mostly in place by the first few decades of the 20th century. The procedures of comparing groups, assigning individuals to treatments, and statistically analyzing group comparisons had been developed by 1940. During the 1960s, the types of experimental designs were identified and the strengths (e.g., control over potential threats) of these designs specified by 1980. Since 1980, computers, improved statistical procedures, and more complex designs have advanced experimental research.
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