As the Arctic warms and winters become shorter, hibernation patterns of arctic mammals are expected to change. Sheriff et al. (2011) investigated emergence dates from hibernation of arctic ground squirrels at sites in the Brooks Range of northern Alaska. The measurements shown in the following figure are emergence dates in a sample of male and female ground squirrels at one of their study sites. 1.0- Males 0.6- Females A 0.4 April Date of emergence Cumulative relative frequency 0.8 0.2- 0.0 26 31 5 10 15 20 25 30 March What type of graph is this? The date at which cumulative frequency reaches 0.50 is the Which sex has the earliest median emergence date? Which sex has the greater IQR? Which sex has an approximate IQR of 8 days? Which sex has an approximate IQR of 4 days? (mean, median, or mode)

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