Pershing's push into Mexico was called a “punitive expedition” a. so that it would not be mistaken for an invasion.
b. because we wanted Mexico to believe it was a war.
c. because we wanted everyone to know it was a very small operation.
d. because we wanted the world to know we were punishing Germany.

Dr. redbull conducts a study to determine whether her new energy drink children perform better on spelling tests. she randomly assigns children to one of two groups: group 1 receives her energy drink and group 2 receives water. she then gives both groups a spelling test and compares the results. which of the following is true about this study? a. group 1 is the dependent variable and group 2 is the independent variable. b. this is a correlational study. c. group 2 is the experimental group. d. the independent variable is the type of drink the children receive.