The kangaroo rat, found in the more arid regions of the western and southwestern United States, is almost perfectly adapted to life in the desert. A kangaroo rat can survive without ever drinking any water by getting needed moisture from seeds. It has pouches on the outside of its cheeks, vwhich it uses to carry seeds back to its burrow. A researcher is studying spatial memory in kangaroo rats by running the rats through a radial arm maze designed to measure spatial learning and memory. Each rat's score is equivalent to the number of arms of the radial arm maze it investigates. A higher score indicates a rat that is more curious and therefore more spatially intelligent. Figure 1: A radial arm maze e Lynn Talton, 2008. Reprinted by permission from the UCLA Behavioral Testing Core Facility. Website: https://btc.psych.ucla.edu/behavioral-testing-core-facilitys-available-tasks/mouse-and-rat-services/radial-arms-maze/ On the first day, the researcher runs 10 kangaroo rats, which receive the following scores: 6 4 5 4 6 4 8 7 5 4