Nov 16, 2010 learning outcomes, their share of low-performing schools, the extent to which ... this research is experimental designs in which subjects are randomly assigned ... Source: oecd (201, PISA 2009 Results: What Students Know and Can ... conditions, making comparisons or contrasts around a single feature,.... The experiment involved swinging a pendulum with different independent variables ... Sources of error may be the human measurement of stopwatch, human... 538a28228e mauelme
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