An earlier evaluation found that after two years, Higher Achievement had statistically significant positive impacts on both math and reading test scores. (mdrc.org)
For managers, this improvement could be the deciding factor in learning whether online advertising has a clear and statistically significant positive impact. (sciencedaily.com)
In reality, there have been 13 randomized controlled gold standard studies of the effect of school choice policies, all but one of which found a statistically significant positive impact. (cato.org)