contestada

A researcher designs a study that will investigate the effects of a new
statistical software on graduate students' understanding of statistics. The
researcher creates a survey, consisting of 10 questions. She compares two
samples, each containing 10 randomly selected students. One sample
consists of students graduating in May. The other sample consists of
students graduating the following May.

A. The sample size is too small.
B. One sample has more graduate level experience than the other
sample.
C. An exam should be used, instead.
D. Randomly selected students were used.