| Date | November 2018 | Marks available | 1 | Reference code | 18N.1.HL:.tz0.23 |
| Level | Higher Level | Paper | Paper 1 | Time zone | time zone 0 |
| Command term | Question number | 23 | Adapted from | N/A |
Question
Which of these describes appropriate study design?
A. Placebos are assigned to an experimental group.
B. In a double blind trial the researcher knows which is the control group.
C. Randomisation allows participants to choose the experimental group.
D. In the control group participants take a placebo.
Markscheme
D
Examiners report
Third hardest question (60.12% correct). Surprising amount seem unsure about use of placebo in experiments.
