Back in October I offered five guidelines on “how to be a better guesstimater,” ways to hone your skills at guessing and estimation — guesstimation — that will help us minimize innumeracy.
A recent Washington Post article—“Majority of U.S. public school students are in poverty”—shows how applying these five tips could prevent people from falling for obviously inaccurate reporting. Here is the main claim of the article:
For the first time in at least 50 years, a majority of U.S. public school students come from low-income families, according to a new analysis of 2013 federal data, a statistic that has profound implications for the nation.
The Southern Education Foundation reports that 51 percent of students in pre-kindergarten through 12th grade in the 2012-2013 school year were eligible for the federal program that provides free and reduced-price lunches. The lunch program is a rough proxy for poverty, but the explosion in the number of needy children in the nation’s public classrooms is a recent phenomenon that has been gaining attention among educators, public officials and researchers.
Are those numbers accurate or even plausible? Let’s see how we could apply the tools of guesstimation to this claim.