To research a difference between men and women, discussable results can be obtained by testing only five men and five women. Such is evident from this experiment:
“Trade-offs between force and accuracy in human hammering performance”
Duncan J. Irschick and Justin Henningsen
University of Massachusetts5 Women, 5 Men
5 trials per treatment
3 Nail sizes
These results have been discussed in numerous news reports, typified by a June 29, 2009 MSNBC report headlined “Study finds that females pound nails more accurately“.