In an analysis of hunting by African lions, biologists filmed prey captures from the safety of their vehicles. The capture of prey was divided into a sequence of events for study, one of which is the stalk, defined as the reduction of predator-prey distance for prey that has been specifically located and the prey is unaware of or minimally alarmed by the predator. The investigators identified two types of stalk: (a) "crouching," - the lion is concealed and either the lion advances toward the prey or the prey advances (unaware) toward the lion, and (b) "running," - the lion is less concealed and advances toward the prey in a rapid manner. Data on lions' stalks of Thomson's and Grant's gazelles from a random sample of 150 kills is summarized in the table below. Characteristic Numeric Value Mean stalking time 31.6 min Standard deviation of stalk time 16.4 min Proportion of stalks of the crouching type 0.92 Researchers believe that the proportion of stalks that are the crouching type is about 0.87. Do the data above provide evidence that the researchers' belief is incorrect and that the proportion of crouching stalks of Thomson's and Grant's gazelles is different from 0.87?

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