7.6 A data set is subject to two independent scans. In the first scan, 11 events of a given type x are identified and in the second, n2 events of the same type are found. If there are n12 events in...

H7

Extracted text: 7.6 A data set is subject to two independent scans. In the first scan, 11 events of a given type x are identified and in the second, n2 events of the same type are found. If there are n12 events in common in the two scans, what is the efficiency Ej of the first scan and what is its standard deviation? Estimate the total number of events of type x.