Suppose a group of students who reported smoking marijuana was found to have lower test scores than a group of students who reported they don't smoke marijuana. What is the most that can be concluded with regard to the population of all students?
a. Smoking marijuana causes lower test scores.
b. Smoking marijuana may be related to lower test scores.
c. Students who smoke marijuana have lower test scores than students who don't.
d. None of the above.
Question 2
Why is it important to know how the individuals or objects in a study were selected?
a. It is important to know to whom the results can be extended.
b. It is important for determining whether or not there is bias in the results.
c. Both a) and b) are true.
d. It is not important to know how the individuals were selected; only the size of the sample matters.
Normal and abnormal corneal light reflection test
Group of Chickens
Group of Ants
The Lower Extremities
Mendel’s test cross to verify independent assortment
Students working around a computer