Chi-Square (χ2) Statistic: What It Is, Examples, How and When to Use the Test

A chi-square (χ2) statistic is a test that is used to measure how expectations compare to actual observed data or model ...
NPR

A new Nation's Report Card shows drops in science, math and reading scores

New test scores from the National Assessment of Educational Progress (NAEP), also known as the Nation's Report Card, show eighth-graders' science scores have fallen 4 points since 2019 and ...