Question

I think letter A is “yes”, but I don’t know how to put the answer into words. I thought B was “sample mean” because how could you get data on a whole population? But, mu is in the confidence interval. Can someone please explain both answers (A and B)?

23. Pitcher plants of the genus Nepenthes are typi- cally carnivorous, obtaining a great deal of their nutrition from insects that become trapped in the pitcher, die, and decay. N. lowii, a pitcher plant from Borneo, produces a second type of pitcher that attracts tree shrews (Tupaia mon- tana), which provide nutrients by defecating into the pitcher8 while they feed on a substance secreted by the plant. Based on measurements o 20 plants, Clarke et al. (2009) calculated a 95% confidence interval for the mean fraction of total leaf nitrogen in the plant species derived from tree shrews: 0.57 < μ < 1.0. a. Does this result imply that individual plants receive between 57% and 100% of their leaf nitrogen from tree shrews? Explain Is the confidence interval meant to bracket e sample mean or the population mean?

Answer 1