a)What is the standard error of the average time to stalk the gazelles?

b)What is the 95% confidence interval for the average time to stalk the gazelles would be centred on?

c)What is the margin of error of a 95% confidence interval for the average stalking time?

In an analysis of hunting by African lions, biologists lmed 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, dened as the reduction of predator- prey distance for prey that has been specically located and the prey is unaware of or minimally alarmed by the predator. The investigators measured two variables: i) Type 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, and ii) Duration time of the stalk. Data on lions' stalks of Thomson's and Grant's gazelles from a sample of 151 kills appear in the table below. value i) Proportion of stalks of the crouching type ii) Mean stalking time 24.9 min Standard deviation of stalk time 3.0 min