Possible model for antibiotic effectiveness
After showing the distribution of Y at each x as a histogram on the previous page, this page presents a possible model for the data to be normal distributions for each x.
Again, drag the centre of the diagram to rotate it.
By rotating the diagram to superimpose the normal pdfs, you can also discuss linearity and constant variance implied by this model.
Click Take sample to show random samples from this model.
The model claims that the observed data (previous page) are a sample of this form.
An experiment was conducted to assess how well an antibiotic, polymyxin B, killed the bacterium, Brucella bronchiseptica. Petri dishes containing the bacterium (grown in agar) were used and different doses of the antibiotic were added. The diameter of the area cleared around the addition point were recorded. Each of 6 different doses of antibiotic was used 10 times.