A psychologist investigates how environmental and cognitive factors influence task performance. Which of the following research measures obtained during their study represents interval level data?
The classification of infants into attachment types (e.g. secure, insecure-avoidant, insecure-resistant) using the Strange Situation
The finishing positions (first, second, third, etc.) of participants in a selective attention task
The scores of participants on a standardised test of emotional intelligence, which has equal, predetermined intervals but no absolute zero
The reaction time (in milliseconds) of participants when responding to a visual stimulus on a screen
