Dr. Nguyen is studying how the quality of breakfast influences academic performance for elementary school children. A sample of 100 children is selected. Fifty children are provided with a nutritious breakfast when they arrive at school each morning. The other 50 children are given a doughnut each morning. After three months, Dr. Nguyen records the academic achievement level for each child and compares the two groups of scores. In this example, how many levels are there for the independent variable?
a. 1
b. 2
c. 50
d. 100
Question 2
A clinical trial is most likely to use a ____ sample.
a. nonprobability
b. probability
c. random
d. simple
Major Findings of the High Scope Preschool Study High Scope participants showed better academic per
Elementary particles included in the Standard Model
Air Quality Index
Trends in Air Quality
Climate influences the locations of biomes
Eating Breakfast Means More Energy and Fewer Calories throughout the Day