Only in climate science is a line defined by a single point, and always with a positive slope. And, of course, n=1 is a statistically significant sample.
There is no way to make a valid causal connection between that (and any other) hurricane, and global warming. Al Gore tried to do the same thing with hurricane Katrina, in his movie "An Inconvenient Truth". There was no science behind that connection, either. In fact, a lawsuit was filed in the UK over the various unsubstantiated claims in the movie, and Gore lost. The judge determined that there were 9 claims in the movie which ran afoul of their laws prohibiting the propagandizing of schoolchildren. They would have determined there were more, but that was all the time the judge had. Today, that movie cannot be shown to UK schoolchildren unless it is accompanied by a document which outlines the errors.
That hurricane Katrina was related to global warming was error #7.
Christopher Monckton wrote a paper which cataloged a total of 35 errors in the movie. You can read it here:
http://scienceandpublicpolicy.org/monckton/goreerrors.html
Proposing a causal connection between hurricane Sandy and global warming is not scientifically valid. It cannot be proven; more importantly, the claim cannot be falsified. Anything that cannot be falsified cannot be taken to be true (see Popper's principle of falsifiability).
If one wishes to make a connection between global temperatures and hurricanes, you first will have to show a trend, over some time period, which correlates with temperatures. The correlation must reject the null hypothesis at the 95% level; then you have to propose a model as to how that works; and, finally, to show causation (not just correlation), you have to show that the model predicts events in the real world--reliably.
The 30 year trend in tornadoes, hurricanes and tropical storms are all negative. Any correlation between these types of storms and global warming is either falsified, or not statistically significant.
Based on the above, claims that hurricane Sandy is a product of global warming are not science; they are propaganda.