A researcher is interested in the effect of teacher-student ratios. She finds 10 fifth-grade classrooms with 3040 students per class and 10 others with 1525 students per class.
She discovers that there is a negative correlation between class size and student achievement. Which one of the following conclusions can we draw from this study?
a. Class size can help us predict school achievement.
b. Classes should be as large as reasonably possible.
c. Classes should be as small as reasonably possible.
d. The researcher has conducted a descriptive study.
Question 2
Imagine you are an educational researcher who wants to learn about the type of psychological environment in which middle school students feel most comfortable and best able to concentrate on their studies.
You plan to examine a wide variety of factors that might contribute to such an environmentboth physical factors (e.g., cleanliness and colorfulness of the school building) and social factors(e.g., teacherstudent relationships, general tolerance for diverse behaviors and beliefs). You realize that students might identify important factors that you yourself haven't even thought of. In this situation, your best choice would probably be:
a. A descriptive, quantitative study
b. An experimental study with at least three treatment groups
c. An experimental study with one treatment group and one control group
d. A qualitative study
An example of the founder effect with subsequent adaptive radiation.
Effect of the chemical environment on pKa
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