Bats Feed on Insects at Night and Sleep During the Day

question 19

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.

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Definitions:

Confidence Level

The percentage or level of certainty that a statistical parameter lies within a specific interval.

Population Standard Deviation

A measure that quantifies the amount of variation or dispersion of a set of data values in a population.

Sample Size

The count of data points or repeated measurements contained within a statistical sample.

Population Standard Deviation

A measure of the dispersion or spread of all individual values from the mean of a population.