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
Changes in light quality with depth: (a) the rich colours on a shallow coral reef;
A colourful male guppy courting a female guppy: What are the influences of mate selection by female
International Performance in Reading, Math, and Science, Eight Grade
Child influences on parents, parenting influences on children, and influences of the marital ...
Example of an employee performance evaluation form Cont
My march breakfast