The phrase 'hypothesis why' is correct and can be used in written English.
Generally, you can use it whenever you are introducing an explanation or rationalization for why something is the case. For example: "We can only offer a hypothesis why the experiment failed: the temperature of the room was too low."
"You have to know or at least have a hypothesis why having a dog makes a good computer programmer," Professor Mumford said.
One possible hypothesis why the above-mentioned protein-DNA and protein-protein interface properties are expected to depend on the number of proteins in a complex is that when two proteins are free (not bound to DNA) they are more able to find the best patches (on both proteins) to produce the most stable complexes possible, with the highest affinity between components.
A chemical category is chosen based on a clear hypothesis why the AOP would be possible to read-across in between source and target.
While this is a significant improvement in dystrophic pathology, one has to question, given the hypothesis, why the extent of recovery is not greater.
However, it is worth noting that none of the above-mentioned studies presented any clear hypothesis why 2D:4D should correlate with an individual's reproductive success.
There are several hypotheses why high TSP-1 levels are associated with poor outcome.
There are a number of hypotheses why this group reports differently.
Our results offer reasonable hypotheses why, after initial infection of one udder quarter, massive expansion of the bacteria in neighboring quarters is suppressed.
Hypotheses why patients do not wish to be enrolled mostly refer to the idea of "problem patients", i.e. not active and not motivated patients with a low therapy adherence.
There have been numerous hypotheses why this is not what is observed in nature: for instance, environmental changes require new adaptions [ 1, 2] or coevolution can imply continuous adaptation without increasing the average fitness [ 3- 5].
Joubert's description suggests one hypothesis about why men like making women laugh.
