Giraffes have excellent vision. Refer to the African Zoology

(Oct. 2013) study of a giraffe’s eyesight, Exercise 7.38

(p. 362). Recall that the researchers measured the eye mass for a sample of 27 giraffes native to Zimbabwe, Africa, and LO6 found x = 53.4 grams and s = 8.6 grams. Suppose the objective is to sample enough giraffes in order to obtain an estimate of the mean eye mass to within 3 grams of its true value with a 99% confidence interval.

a. Identify the confidence coefficient for this study.

b. Identify the desired sampling error for this study.

c. Find the sample size required to obtain the desired estimate of the true mean.