Smelling Out the Enemy. In Exercise 8.72, you found a 90% confidence interval for the mean number of tongue flicks per 20 minutes for all juvenile common lizards to be from 456.4 to 608.0.

Obtain the margin of error by

a. taking half the length of the confidence interval.

b. using Formula 8.1 on page 364. (Recall that n = 17 and that

σ = 190.0.)