AtlasSession 2L6: Hypothesis Testing and Statistical Testsp.41–42
CIs and p-values
- 4 earlier topics
- What is a hypothesis
- Test, null and alternate hypotheses
- Alpha error
- Tests, p-values, significance
- CIs and p-values
- Next: Beta error and power
Fig. 1
Cell viability (%) on chitosan vs PCL scaffolds: difference 6.2 percentage points at SD 13, n = 50 per group
Fig. 1. Chitosan minus PCL: a gap of 6.20 pp, with a range of 1.10 to 11.30 pp. “No difference” is outside the range.
- Gap (chitosan − PCL)
- 6.20 pp
- Range for the gap
- 1.10 to 11.30 pp
- “No difference” inside the range?
- no
Sampling Simulator · First look
Level 1 · First look · Lecture 6 · p.41–42
Read a difference together with its range and check whether 'no difference' sits inside it.
Judge significance from the CI of a difference, and know when two groups' separate CIs can and cannot stand in for it.
Gap with a range (the step you are on)
Like 'arriving in 20 minutes, give or take 5'; chitosan beats PCL by 6.2 points (1.1 to 11.3).
Like ‘arriving in 20 minutes, give or take 5’: chitosan beats PCL by 6.20 points, and the likely range for that gap runs from 1.10 to 11.30 points.