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Arctic Sea Ice Extent (September) vs US Secondary School Enrollment

Arctic Sea Ice Extent (September) and US Secondary School Enrollment correlate at r = -0.50 over 28 years (1979–2022), p = 0.0066. With the time trend removed, r = +0.07. Interpret with caution.

Verdict: Interpret with caution. Much of the apparent link is driven by a shared time trend: r falls from -0.50 to 0.07 once the trend is removed.

Pearson r
-0.50
p-value
0.0066
Years compared (n)
28 (1979–2022)
95% confidence interval
-0.74 to -0.16
Correlation with the time trend removed
+0.07

Sources

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Correlation does not imply causation. How the verdict is worked out.