Bats Feed on Insects at Night and Sleep During the Day

Essay

Bats feed on insects at night and sleep during the day. Many species of bats use theundersides of bridges for sleeping places. The beams that support a bridge create twokinds of spaces in equal numbers: wide (approximately 55 cm) and narrow(approximately 17 cm.) Biologists believe the bats choose narrow spaces to providemore safety from predators. Investigators studying the sleeping position choices ofthe Big-eared Bat (Corynorhinus rafinesquii) observed that 67 out of 102 of themchose narrow beam spaces in which to sleep.Does this sample provide sufficient evidence to conclude that the bats prefer narrowover wide sleeping space?
Use a significance level of .05 to test the appropriatehypotheses.