26. Hyenas, famously, laugh. (The technical term used by hyena biologists is "giggle." ) Mathevon 0.32 0.50 0.43 0.37 cl al. 2010) investigated the information content 0.44 0.30 of hyena giggles . In one analysis , they compared 1.46 0.58 the giggles of pairs of hycnas , in which one 0.50 1.89 member of each pair was the more dominant and 11 0.50 0.67 the other socially subordinate . They measured eema 12 0.50 D.34 the spectral variability of the hyena giggles 13 0.53 0.48 using the coefficient of variation (C'V ) of sound 14 0.54 1.73 15 spectrum features . Here are the data with these 0.55 0.80 16 measures for each member of the pairs : 0-55 1.86 17 0.60 1.77 Spectral CV of Spectral CV of 18 0.60 0.57 dominant subordinate 19 0.64 1.87 Individual individual 20 0.65 0.62 0.384 0.507 31 0.67 0.93 .386 0.569 22 0.70 1.00 0.252 0.235 23 0.70 0.81 D.226 0.41 24 0.79 1.92 0.323 75 0.436 0.79 1.00 0.287 0.451 0.303 D.395 0.317 0.220 28 . Does holding a weapon increase your aggres 0.277 0.338 siveness afterward in other situations? Kline- smith cl al. (2006) investigated this question by assigning 30 male college students to one of Do dominant and subordinate individuals differ two groups. One group of 15 men were given in the means of giggle spectral CV ? a facsimile handgun to hold for 15 minutes , 27 . Refer to Practice Problem 16. The accompany whereas the 15 men in the other group were ing data are the values of mosquito activation given a loy instead. All men were then asked to (fraction of 50 mosquitos that left the container ) participate in a test of taste sensitivity. Each was recorded on the 25 participants before and after given a glass of water with a single drop of hot drinking one liter of the local beer. sauce to taste . Each man was also asked to add as much hot sauce as he wanted to a new glass of water to be given to the next person. (These W32_Ch12_p327 -368 Indd 363 5/3/14 7:06 PM