C3. Randomised Controlled Trials

Question 1

What does randomisation do?

Answer 1

Randomisation of treatment makes it independent of potential outcomes.

Mean potential outcomes are identical for the treated and the untreated groups.

Question 2

If you split the population randomly into two groups, what would you expect in terms of attributes?

Answer 2

They would be the same in each population: the average heights, average income, proportion of those with brown eyes etc.

Same goes for potential outcomes.

Question 3

Implication of random assignment of treatment

Answer 3

Question 4

Two effects of randomisation

Answer 4