21.

21. Ecology: Hummingbirds Bill Alther is a zmlopst stud* Ann*s (Cobre anna: Reference: Hummingbirds by K Lmg and W Alther)- Suppe that a rervze Grand Canyon. a random sample of of these birds was czu#it. and released wet*tts (in yams) were The sample mean ts 2 z Let z be a ran&rn vanabie representmg we:$ts M Anais hummrngS:rds tn this pan of the Grand Carryon We assume that z has a normal 0.70 It known that foc population of an Anna*s Do the data Indicate that the mean wee: Sese birds par the Carryon less than cams' Use a z 001.