Extinct New Zealand birds. Refer to the Evolutionary Ecology Research (July 2003) study of the patterns of extinction in the New Zealand bird population, presented in Exercise. Suppose you are interested in estimating the mean egg length (in millimeters) for the New Zealand bird population.
a. What is the target parameter?
b. Recall that the egg lengths for 132 bird species are saved in the NZBIRDS file. Obtain a random sample of 50 egg lengths from the data set.
c. Find the mean and standard deviation of the 50 egg lengths you obtained in part b.
d. Use the information from part c to form a 99% confidence interval for the true mean egg length of a bird species found in New Zealand.
e. Give a practical interpretation of the interval you found in part d.
Extinct New Zealand birds. Refer to the Evolutionary Ecology Research (July 2003) study of the patterns of extinction in the New Zealand bird population, presented in Exercise. Consider the data on the egg length (measured in millimeters) for the 132 bird species saved in the NZBIRDS file.
a. Find the mean and standard deviation of the egg lengths.
b. Form an interval that can be used to predict the egg length of a bird species found in New Zealand.
Extinct New Zealand birds. Refer to the Evolutionary Ecology Research (July 2003) study of the patterns of extinction in the New Zealand bird population, Exercise. Data on flight capability (volant or flightless), habitat (aquatic, ground terrestrial, or aerial terrestrial), nesting site (ground, cavity within ground, tree, or cavity above ground), nest density (high or low), diet (fish, vertebrates, vegetables, or invertebrates), body mass (grams), egg length (millimeters), and extinct status (extinct, absent from island, or present) for 132 bird species that existed at the time of the Maori colonization of New Zealand are saved in the NZBIRDS file. Use a graphical method to investigate the theory that extinct status is related to flight capability, habitat, and nest density.
Extinct birds. Biologists at the University of California (Riverside) are studying the patterns of extinction in the New Zealand bird population. ( Evolutionary Ecology Research , July 2003.) At the time of the Maori colonization of New Zealand (prior to European contact), the following variables were measured for each bird species:
a. Flight capability (volant or flightless)
b. Type of habitat (aquatic, ground terrestrial, or aerial terrestrial)
c. Nesting site (ground, cavity within ground, tree, cavity above ground)
d. Nest density (high or low)
e. Diet (fish, vertebrates, vegetables, or invertebrates)
f. Body mass (grams)
g. Egg length (millimeters)
h. Extinct status (extinct, absent from island, present)
Identify each variable as quantitative or qualitative.
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