Study of guppy migration. In a study of the excessive transitory migration of guppy populations, 40 adult female guppies were placed in the left compartment of an experimental aquarium tank divided in half by a glass plate. After the plate was removed, the numbers of fish passing through the slit from the left compartment to the right one, and vice versa, were monitored every minute for 30 minutes. (Zoological Science, Vol. 6, 1989.) If an equilibrium is reached, the researchers would expect the median number of fish remaining in the left compartment to be 20. The data for the 30 observations (i.e., numbers of fish in the left compartment at the end of each 1-minute interval) are shown in the table at the bottom of the page. Use the large-sample sign test to determine whether the median is less than 20. Test, using α = .05.
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