Motorcycle fatalities have increased dramatically over the past decade. As a result, manufacturers of powered two-wheelers (PTWs) are tweaking their design in order to improve visibility by automobile drivers. The factors that impact the visibility of PTWs on the road were investigated in Accident Analysis and Prevention (Vol. 44, 2012). A visual search study was conducted in which viewers were presented with pictures of driving scenarios and asked to identify the presence or absence of a PTW. Of interest to the researchers is the detection rate, i.e., the proportion of pictures showing a PTW in which the viewer actually detected the presence of the PTW. Suppose that, in theory, the true detection rate for pictures of PTWs is .70. The study revealed that in a sample of 2,376 pictures that included a PTW, only 1,554 were detected by the viewers. Use this result to test the theory at α = .10.