Science 9 – Today in science 9 the students extracted DNA from strawberries. The lab is fairly straight forward and is well known in education. With not too much prep, the students are actually extracting DNA – every time I think about this, it blows my mind! 145 more words
Tags » Experimental Design
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How can we balance concerns about internal validity and external validity—simultaneously? This seems to be an inescapable catch-22: We either conduct an experiment that maximizes internal validity (at the expense of external validity), or conduct a field study that maximizes external validity (at the expense of internal validity).
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David Brillinger, a statistician at the University of California, Berkeley, says that Darwin’s method of pairing is now common practice. “Darwin was a leader in a subfield of statistics called experimental design,” he says.
How many students would vote to have more tests in their classes? It’s hard to imagine that adding more tests would increase instructor popularity, but new research indicates that when testing is done in the right way, it can increase knowledge and be easy to swallow. 175 more words