Refer to Exercise 9 .10, where a zoologist collected 20 wild lizards in the southwestern United States. Do these data substantiate a claim that the mean length is greater than 128 mm? Test with a = .05.

Data from in Exercise 9 .10

A zoologist collected 20 wild lizards in the southwestern United States. The total length (mm) of each was measured.

179   157   169   146   143   131   159   142   141   130
142   116   130   140   138   137   134   114    90     114

Obtain a 95% confidence interval for the mean length.