In Seychelles warblers, young adult females known as subordinates sometimes hang around the territories of older birds. Sometimes these subordinates help feed the offspring of the older birds, and sometimes not. In one study, subordinate birds that did not help were genetically assessed to discover whether they were related to the offspring of the older birds (Richardson et al. 2003). A “relatedness” score was assigned to each subordinate, with a value of zero meaning no relationship to the offspring.

Out of five subordinates examined, the mean relatedness was −0.05 with standard deviation 0.45 (relatedness can be negative if by chance sampled individuals are less related than the population as a whole). What is the 95% confidence interval for relatedness of unhelpful subordinates to the offspring?