Specification: f(x) = x²

Extreme point: 0.324

Test

H1: U shape

vs. H0: Monotone or Inverse U shape

Lower bound

Upper bound

Interval

0.0174

0.552

Slope

−3.523

2.624

t-value

−4.699

2.616

P>|t|

0.000561

0.0140

Overall test of presence of a U shape

t-value = 2.620

P > |t| = 0.0140