This description and graph are used to answer questions 35-38

Researchers were interested in whether there was any difference between four diets given to newborn chicks with respect to the chicks' weight. The chicks were randomly divided into 4 groups and were fed the specific diet for 20 days, their weights measured every 5 days. A scatterplot of the data taken from 578 chicks is:

Scatterplot of Chick Weight vs Age Colored by Diet 300 - Diet Weight (gm) 200 - 2 4 O 100 - YOU O - 10 15 20 Age (days)