Bellringer: On the worksheet you got at the door, construct a testable question for each pair of facts.

Example: 1. Cars give off pollution.2. Loghan lives farther away from Wamogo than Nate.

How will the greater distance Loghan lives from Wamogo affect the amount of pollution she produces on the way to school each day.

Today 9/26

• Bellringer• Hypotheses• Penny Lab

What is a hypothesis?

Hypothesis

• A reasonable explanation to explain a phenomenon.

• Must be testable and falsifiable.

• multiple working hypotheses: Two or more hypotheses that can be tested simultaneously or in sequence.

Good Hypothesis?

• Everyone in the world thinks the Cowboys are better because they have won 6 Super Bowls.

• Ghosts can walk through walls because they have supernatural powers.

• At least one Carbon atom in the world has a smiley face on its nucleus.

Why is atmospheric CO2 increasing?

Come up with a hypothesis for each!

• Carbon dioxide is released into the atmosphere by volcanoes when they erupt.

• Carbon dioxide is released when fossil fuels are burned.

Examples

• Atmospheric CO2 has increased over the past five decades, because the amount of CO2 gas released by volcanoes has increased.

• The increase in atmospheric CO2 is due to the increase in the amount of fossil fuels that are being burned.

Testing a Hypothesis!

Testing a Hypothesis!

CausationSugar consumption up. Global temperatures up. Is one causing the other?

Correlation

correlation: A mutual relationship between two or more things.

VS.causation: The relationship between an event and another event in which one event caused the other event.

Vocab

• mechanism: The process by which something takes place.

• negative correlation: 2 things change in opposite directions

• positive correlation: 2 things change in same direction

Video

• Freakonomics!

• What kind of correlation do ice cream consumption and polio have? Explain the causality and correlation depicted in this video.

• http://www.youtube.com/watch?v=lbODqslc4Tg