Figure 1 : A visual representation of the 95% confidence intervals for the proportion
of successes per IV attempt.

A line has been drawn through the graph at 43%, to illustrate that each interval overlaps, indicating that the
assumption of independence required for the negative binomial setting is reasonable.

Brinkley et al.Journal of Medical Statistics and Informatics  2014 2:6DOI : 10.7243/2053-7662-2-6