Bighorn sheep are beautiful wild animals found throughout the western United States. Data for this problem are based on information taken from The Desert Bighorn, edited by Monson and Sumner (University of Arizona Press). Let x be the age of a bighorn sheep (in years), and let y be the mortality rate (percentage that die) for this age group. For example, x = 1, y = 14 means that 14% of the bighorn sheep between 1 and 2 years old die. A random sample of Arizona bighorn sheep gave the following information:

Complete parts (a) through (c), given ˆ‘x = 15, ˆ‘y = 86.9, ˆ‘x2 = 55, ˆ‘y2 = 1544.73, and ˆ‘xy = 273.4.

(a) Draw a scatter diagram for the data.

(c) Find the sample correlation coefficient r and the coefficient of determination r2. What percentage of variation in y is explained by the least-squares model?

Understanding Basic Statistics

6th edition

Authors: Charles Henry Brase, Corrinne Pellillo Brase

ISBN: 978-1111827021

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