Two graphs: a histogram and a Normal plot.
The histogram of birth weight is negatively skew. A Normal curve is superimposed which does not fit the histogram closely at the lower end.
The Normal plot shows Inverse Normal on the horizontal axis and birthweight on the vertical axis. The points are close to the straight line at the high value end. The points are clearly lower than the straight line at the low value end.
Back to Clinical Biostatistics: Inference about means.
This page maintained by Martin Bland.
Last updated: 2 August, 2006.