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Identifying Variables & Designing Identifying Variables & Designing Identifying Variables & Designing Identifying Variables & Designing Investigations NotesInvestigations NotesInvestigations NotesInvestigations Notes

3 Kinds of Variables3 Kinds of Variables3 Kinds of Variables3 Kinds of Variables 1. 2. 3.

Example # 1Example # 1Example # 1Example # 1 Problem: Independent Variable: Dependent Variable: Constant Variables:

Example # 2Example # 2Example # 2Example # 2 Problem: Independent Variable: Dependent Variable: Constant Variables:

Example # 3Example # 3Example # 3Example # 3 Problem: Independent Variable: Dependent Variable: Constant Variables:

Example # 4Example # 4Example # 4Example # 4 Problem: Independent Variable: Dependent Variable:

Constant Variables:

Dogs and Turnips ActivityDogs and Turnips ActivityDogs and Turnips ActivityDogs and Turnips Activity

Conclusion # 1 __________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ Conclusion #2 __________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ Conclusion #3 __________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ Conclusion #4 __________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

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OBSERVATIONS VS. INFERENCESOBSERVATIONS VS. INFERENCESOBSERVATIONS VS. INFERENCESOBSERVATIONS VS. INFERENCESIn science, there are two basic kin

that you can directly see or show are called mass, number of branches, and things like about or use logic in order to prove are called the observation that a giraffe has a long neck (we can see it), and the that a giraffe eats leaves (if we see the githat a giraffe/s long neck helps it reach leaves to eat, that is an putting two and two together. Try and fand which are inferences. Put a letter O neto the inferences.

The table is two feet high.

The table has four legs.

The table was brought in by the custodian.

That frog is green.

All frogs are green.

Yesterday, there were 45 cows in the field.

Today, there are only 40 cows in the field.

The cows must have been abducted by aliens.

Those tracks are three inches long.

Those tracks were made by a mouse.

That gold brick is ten kilograms.

That silver brick is seven kilograms.

Gold is heavier than silver.

All metals are heavy.

OBSERVATIONS VS. INFERENCESOBSERVATIONS VS. INFERENCESOBSERVATIONS VS. INFERENCESOBSERVATIONS VS. INFERENCES kinds of facts that people talk about. Things

that you can directly see or show are called observations. For example, color, height, e that. Other facts which you have to think

r use logic in order to prove are called inferences. For example, we can make that a giraffe has a long neck (we can see it), and the observation

giraffe munching on some leaves), but to say that a giraffe/s long neck helps it reach leaves to eat, that is an inference, we/re

figure out which of these are observations next to the observations and a letter I next

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The table was brought in by the custodian. ____

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Yesterday, there were 45 cows in the field. ____

Today, there are only 40 cows in the field. ____

The cows must have been abducted by aliens. ____

Those tracks are three inches long. ____

were made by a mouse. ____

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That silver brick is seven kilograms. ____

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A clear data table must:A clear data table must:A clear data table must:A clear data table must:

Show the relationship between the independent and dependent variables

Show the order in which the independent variable was changed Have a title which communicates why your experiment was

done

General Rules:General Rules:General Rules:General Rules: The independent variable is usually recorded in the left column

and the dependent variable in the right. When repeated trials are conducted, they are recorded in

subdivisions of the dependent variable column. If an operation is performed on the data (averages, sums,

etc.,) this information is recorded in an additional column to the right.

The values of the independent variable are ordered (usually, smallest to largest.)

The title of the table should name both the dependent and independent variables and communicate the purpose of the experiment, i.e., /The Effect of Light on the Growth of Radish Seeds./ The independent variable is the amount of light and the dependent variable is the growth of the seeds.

Task:Task:Task:Task: Draw a data table to record data for this experiment for the next 5 school days.

Best Value and Uncertainty