Hannah G.

Precalculus

2 years, 1 month ago

On the first day of class, a third-grade teacher is told that 12 of his students are
“gifted,” as determined by IQ tests, and the remaining 12 are not. In reality, the two
groups have been carefully matched on IQ and previous school performance. At the
end of the school year, the gifted students have a grade average of 87.2 with s = 5.3,
whereas the other students have an average of 82.9, with s = 4.4. Perform a t-test to
decide whether you can conclude from these data that false expectations can affect
student performance; use alpha = .05, two-tailed.