highly significantp -value < 0.0001
This model explains more than 50% of the data variance (R 2 marginal = 48.3%; R 2 conditional = 53.3%) and shows a highly significant effect of the colour of the lights ( p -value < 0.0001, Estimate = 0.41) with red lights prompting the answer “warmer” and blue lights prompting the answer “colder” (Fig. 4 ).