The data on the lengths of anacondas on the front piece of the chapter yield a 95% confidence interval for the population mean length of all anaconda snakes in the area of the study.

(a) Is the population mean length of all female anacondas living in the study area contained in this interval?
(b) Explain why you are 95% confident that it is contained in the interval.

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variable N Mean StDev 95.0% CI Length (ft) 21 12.871 2.262 11.842,13.901)