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이 [b O 30. In many animal species, individuals commu- n to reject the null nypothesis : nicate using ultraviolet (UV) signals, such a:s bright patches of skin or feathers, that are visibl to one another but invisible to humans. Secondi et al. (2012) investigated the role of UV colors as sexual signals in two closely related species of Lissotriton newt, by asking whether females find males of their own species more attractive
when UV radiation is present than when UV light is absent. Each trial consisted of confinin a male newt to one end of an aquarium and measuring how much time a female of the s species chose to spend near the male (rather than at the opposite end of the aquarium). Each male was tested both under natural light condi- tions (UV light present) and when UV light was absent (by using a UV filter). The box plots in the following figure (modified from Secondi et al. 2012) show the difference between the two treatments in the time females spent near the males. A positive number indicates that a femai spent more time near the male when UV light was present, and a negative number indicates that she spent less time near the male when light was present.
300 트 200 E 100 ct -200 L. vulgaris L. helveticus the authors tested the null hypothesis that UV light treatment had no effect; that is, Ho: Mean change in time spent close to males- 0. Test results for species are as follows, along wi dence intervals for the mean chang them
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