Social Studies, 30.07.2021 15:20 1fuzzybirdow6e0s
A 2013 study at Johns Hopkins University wanted to measure if caffeine has an effect on short term memory. The researchers showed images to a group of people. They then gave half the group a 200-mg caffeine pill and the other half a placebo pill containing no caffeine. A day later they measured how many images each person could remember. What is the explanatory variable in this experiment
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