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
Cade and colleagues discovered a way to improve athletic performance and prevent salt and water imba
The twin method can be used to investigate genetic and environmental influences on the development o
Example of an employee performance evaluation form.
Breakfast cereals rich in iron, vitamin D and vitamin B-12
What is the contribution of studying wing spot in the field?
Dominican breakfast