The Fair Test Lesson 4 January 26 th

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The Fair Test Lesson 4: January 26 th, 2011

The Fair Test Lesson 4: January 26 th, 2011

Observation vs Inference Observation Information gathered with the 5 senses ◦ Sight ◦ Smell

Observation vs Inference Observation Information gathered with the 5 senses ◦ Sight ◦ Smell ◦ Touch ◦ Taste ◦ Hearing

Observation vs Inference Guess or assumption based on observations, previous knowledge and experience

Observation vs Inference Guess or assumption based on observations, previous knowledge and experience

Examples For the Following pictures make 2 observations and 2 inferences for each picture.

Examples For the Following pictures make 2 observations and 2 inferences for each picture.

Examples Observation Inference - The man is pulling a box - The box is

Examples Observation Inference - The man is pulling a box - The box is heavy - We infer this because the man is sweating. - The man is sweating -The man is thinking about how heavy the box is -We infer this because his eyes are drawn like he is thinking.

Examples Observation - The man is watching a computer screen - The man is

Examples Observation - The man is watching a computer screen - The man is chewing his finger nails. Inference - The man is scared -The man is nervous

Examples Observation Inference - They are carrying a camera and suitcase -They are happy

Examples Observation Inference - They are carrying a camera and suitcase -They are happy - The woman is clicking her heels - They are on vacation

Examples Observation Inference -They have bags that say trick or treat. -They have candy

Examples Observation Inference -They have bags that say trick or treat. -They have candy in the bags. -They are in costumes -It is Halloween

Review of Fair Tests and Variables Fair Testing ◦ Are the following tests

Review of Fair Tests and Variables Fair Testing ◦ Are the following tests fair or not fair? Why or why not? ◦ Which ice is faster for Cheechoo to skate on? Fair– The skater is the same, only the ice is different.

Which ball will bounce higher? Not fair – (2 variables) The balls should

Which ball will bounce higher? Not fair – (2 variables) The balls should be dropped from the same height.

Which Coffee has more caffeine in total? Not fair – The brands of

Which Coffee has more caffeine in total? Not fair – The brands of coffee are different and the size of cup is different.

What makes some of these tests not fair? ◦ Only one thing can

What makes some of these tests not fair? ◦ Only one thing can change at a time How many variables can you change and still have a fair test? ◦ ONE

Activity With a partner, pick a problem that you would like to test and

Activity With a partner, pick a problem that you would like to test and think of a way to make a fair test. Include all the steps necessary for a fair test. Be very specific and be sure to include the independent variable, and controls. You may need to look back in your notes to see what the steps are to the scientific method. When you are done, be sure to show Mr. Hoover your work.