1. REVIEW
UNIT 1 BIOLOGY

2. The Goals of Science To investigate and learn about the natural world.
To develop explanations about the patterns and events in the natural world.
Can you think of a pattern or event that scientists have investigated?
To use those explanations to better understand and make predictions about the natural world.
How can knowledge about that pattern or event help us better understand the world?

3. BIAS Prejudiced presentation of material or
Consistent error in estimation of value

4. Types of bias Sampling bias Measurement bias
Using an unrepresentative sample or group
Using a small sample size
Not using a random sample
Measurement bias
Inaccurate or inappropriate collecting techniques
Allowing external variables to influence measurement

5. A good sample is… Randomly selected Large sample size
Representative of a population

6. The Scientific Method Make an observation Ask a question
Gather information
Form a hypothesis
Conduct an experiment
Collect data
Draw conclusions
Retest
Peer review

7. Types of observations Qualitative: a description Quantitative: numbers
An observation made with your senses (sight, smell, touch, sound).
Quantitative: numbers
Observations that are actual measurements.

8. Hypothesis Must be testable and predict an outcome.
Can be described as an educated guess
Hypothesis should be stated using an “if…., then…” statement.

9. Conduct an experiment Only change 1 variable at a time
Has a control treatment (nothing changed) and an experimental treatment (one thing changed).

10. Variables Independent variable: What you change
Dependent variable: What you measure
Controls: Everything else that stays the same!

11. Collect data Collect data from several trials.
Examine data for trends.
Create chart and graphs to organize and display data.
Repeat experiments.

12. Draw Conclusions
Accept or reject your hypothesis based on your data.

13. Peer review Evaluation by other scientists in the same field
Publishing the experiment & results

14. A THEORY
A hypothesis that is generally excepted as true due to the amount of evidence supporting it.

15. Unit Conversions Changing a measurement from one unit to another.
For example: 1 foot = 12 inches
Likewise: 1 foot = 30.5 cm

16. Metric system
Length: Meters
Weight: Grams
Volume: Liters

17. Countries That Do Not Use the Metric System
map-of-countires-that-use-metric-system-vs- imperial.jpg