Suggested answer to exercise: Confidence intervals for mean FEV1, 4

Question 4: How do the three confidence intervals differ?

Suggested answer

The three confidence intervals can be tabulated as follows:

Confidence interval for mean FEV1 (litres)

Confidence level	Lower Bound	Upper Bound
95%	3.88	4.24
99%	3.82	4.30
90%	3.91	4.21

The 90% confidence interval is narrowest, the 99% confidence interval is widest.

Back to Exercise: Confidence intervals for mean FEV1.

To Applied Biostatistics index.

To Martin Bland's M.Sc. index.

To Martin Bland's home page.

This page maintained by Martin Bland.
Last updated: 6 October, 2006.

Back to top.