This image shows a graph with the heading "Sigma of Noise".

The X-axis of the graph shows a list of numbers, 1, 3, 5,.... up to 47,49, which represents the number of positive events. The Y-axis shows seven response rates from 0.0% to 6.0%.

The line of the graph starts at the point (x=1, y=5.0%) , and follows a hyperbolic progression downwards to (x=49, y=0.8%).