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Learning paths / Choose your research design
Learn step by step · Intermediate

Choose your research design

Define measurements and distinguish timing, sampling and assignment.

7 concepts15 minutes

01

Research question

2 min · Good research starts with a clear question.
02

Variable

2 min · A characteristic that can differ across observations.
03

Operational definition

2 min · Specify how an abstract idea will be measured.
04

Cross-sectional study

2 min · Examine a population during a defined period.
05

Longitudinal study

2 min · Track change through repeated measurements.
06

Random assignment

2 min · Use chance to allocate experimental conditions.
07

A/B test

3 min · Compare two options fairly.
At the end of the path

Review in three questions.

Review the concepts in this path with short questions. Read the explanation after each answer and revisit a concept if needed.

1 / 3 · Longitudinal study

True or false?

Following the same people automatically proves causation.

Revisit the concept ↗

2 / 3 · Random assignment

True or false?

Random assignment and random sampling address different problems.

Revisit the concept ↗

3 / 3 · A/B test

True or false?

Measuring group A and group B in different months guarantees a fair comparison.

Revisit the concept ↗
Practice what you learned

Put this learning path into practice.

Choose a guide connected to the concepts in this path. These optional activities do not count towards your reading progress.