Word: predictors
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Dates: during 1980-1980
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...emissions. Abruptly, the 5-to-1 ratio of carbon dioxide to sulfur dioxide dropped sharply to 2.4 to 1. Similar drops preceded at least two of the post-May 18 eruptions. That raised immediate concern that the volcano was about to blow again. But the ratio is no certain predictor. Says Geologist Bob Noble: "We don't have anything that's 100% accurate...
...scores. As average family income increases, test scores rise proportionately. Many such as Alan Nairn, head of the Nader study group, claim this is direct evidence of an economic bias in the tests. The Nairn-Nader study says ETS statistics show SATs are not a very accurate predictor of a student's first year grades. "Ninety per cent of the time, tests predict a student's first year grades no more accurately than a roll of dice," Massade says. Although Mary Churchill, associate director of the Information Division of ETS, agrees that high school grades are statistically a better indicator...