Mathematical Process Standards>Justifying Mathematical Ideas with Precise Language(TEKS.AQR.9-12.1.G) Practice Test

With $n=50$, a test may detect a statistically significant increase, but the standardized effect size $d$ equals 0.025 (0.3 divided by 12), which is tiny; thus practical significance is negligible even if $p$ is small.

Any nonzero increase proves a real improvement; effect size is not needed.

Because the sample is only 50 campuses, we cannot say anything about significance.

Since the mean went up by 0.3 points, that's a 0.3% improvement, which is large enough to be practically meaningful.