A media company wanted to analyse the difference between males and females in terms of the amount of time spent watching TV. What level of measurement is this?

A research group was interested in the correlation between the time mothers spend cuddling their babies in the first 24 hours after birth and self-reported ratings of attachment at 2 months. What level of measurement is ratings of attachment?

A teacher wants to know if there is a significant difference between the number of facts recalled when students are given a coloured fact-sheet and students given a black and white fact sheet. What level of measurement is this?

A psychologist investigates the possible correlation between hours of sleep and reaction time. What level of measurement is this?

Jamie is researching whether there is a link between age and drink preference. She asks for a sample of teachers and students to see whether they would choose a diet or full-sugar can of cola. What level of measurement is this?

OCD patients are put into two groups, therapy and no therapy and after a month are asked to rate on a scale of 1-50 how much their symptoms have reduced. What level of measurement is this?

Psychologists predicted that the removal of the hypothalamus could cause a change in the number of calories the rat consumed. What level of measurement is this?

Mhariri collects self-reported happiness scores of her friends, before and after a yoga session. What level of measurement is this?

Riley randomly allocated participants so half of them solved anagrams while playing music and the other half solved them in silence. What level of measurement is this?