Harold Shipman was a rural physician in Britain who was discovered in 1998 to have murdered a large number of his patients. A recent article12 provided data on the cumulative number of death certificates by sex that he signed in excess of the local average, totaling 224. Starting from 1978 with the first excess, data were read from the graph, sexes pooled, and total number of excess certificates counted by year. The first four (19781981) were used as baseline and a constant baseline was assumed. The baseline variance was used as the denominator of the Moving F. A Moving F of three data, calculated for 198298, is shown in Fig. 20.11. Find the critical F-value and identify where the number of excess death certificates first becomes significant in probability. How many years of murdered patients would have been prevented if Dr. Shipman had been stopped then?