13. Archaeology: Arrowheads The Wind Mountain archaeological site is in southwest New Mexico. Prehistoric Native Americans called Anasazi once lived and hunted small game in this region. A stemmed projectile point is an arrowhead that has a notch on each side of the base. Both stemmed and stemless projectile points were found at the Wind Mountain site. A random sample of n1 5 55 stemmed projectile points showed the mean length to be x1 5 3.0 cm, with sample standard deviation s1 5 0.8 cm. Another random sample of n2 5 51 stemless projectile points showed the mean length to be x2 5 2.7 cm, with s2 5 0.9 cm (Source: Mimbres Mogollon Archaeology, by A. I. Woosley and A.

J. McIntyre, University of New Mexico Press). Do these data indicate a difference

(either way) in the population mean length of the two types of projectile points? Use a 5% level of significance.