1. The Nature of Science and Scientific Inquiry
What is Science?
The Nature of Science and Scientific Inquiry

2. The Nature of Science
Science is based on observations and inferences about the natural world (empirical evidence).
Science is a creative human endeavor that is socially embedded.
Scientific knowledge is always tentative (subject to change with new knowledge.
Laws and theories are the products of science.

3. Hypotheses
An hypothesis is a statement that predicts the outcome of an experiment.
An hypothesis may be stated as a null hypothesis; that is, the hypothesis may predict no change.
Hypotheses are tested by scientific inquiry.
Tested hypotheses help build scientific knowledge.

4. Scientific Laws
A scientific law is a description of a natural phenomenon.
Laws are based on empirical evidence.
Examples:
Mendel’s laws of inheritance.
The Hardy-Weinberg Law of population genetics.
Laws may change with new knowledge.

5. Scientific Theories
A scientific theory is an explanation of a natural phenomenon.
Theories are based on empirical evidence.
Examples:
The theory of natural selection.
Cell theory.
Theories may change with new knowledge

6. Scientific Inquiry
Scientific inquiry is the process that results in building scientific knowledge.
There are three main types of inquiry (scientific studies):
Descriptive
Correlational
Experimental

7. Descriptive Studies
Descriptive studies describe the object of study in detail.
Characteristic of young sciences.
Some sciences, such as Astronomy and Taxonomy, rely almost entirely on descriptive studies.

8. Correlational Studies
Correlational studies describe two events that occur at the same time, and look for a relationship between the two.
Many health studies are correlational: they use large databases of health information, and try to answer questions when an experiment would be unethical.
However, a correlation does not prove a cause.

9. Experimental Studies
Experimental studies involve setting up control and experimental groups in order to the effects of one variable on another.
Experiments can be used to determine cause.
Experiments are used to test hypotheses (not to “prove” them).

10. Who is a scientist?

11. Who is a scientist?
Ecologists

12. Who is a scientist?
Microbiologists

13. Who is a scientist?
Taxonomists

14. Who is a scientist?
Geneticists

15. Who is a scientist?
Botanists

16. Who is a scientist?
Molecular
Biologists

17. Who is a scientist?
Zoologists

18. Science: A Human Endeavor