Variables, Constants and Controls in Experiments

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Questions and Answers

What is a variable?

Any factors that change during an experiment

What are the two types of variables?

Independent and dependent

What is an independent variable?

The variable that is changed by the person doing the experiment

What is a dependent variable?

The observed variable in an experiment whose changes are determined by the presence of the independent variables Signup and view all the answers

It is only possible to have one what variable?

Independent variable Signup and view all the answers

What is another definition for an independent variable?

A manipulated variable in an experiment whose presence determines the change in the dependent variable Signup and view all the answers

Is the independent variable a cause or an effect?

Cause Signup and view all the answers

Is it possible to have more than one dependent variable?

Yes Signup and view all the answers

What does the dependent variable show?

Shows the effect of changes in the independent variable Signup and view all the answers

Where is the dependent variable usually placed on a graph?

Placed on the y-axis, unless it's time which is always on the x-axis Signup and view all the answers

What is a constant?

Factors that remain the same in all the experimental groups Signup and view all the answers

Why must these factors remain the same?

To make sure they are not affecting the outcome of the experiment Signup and view all the answers

Why are constants called constants?

Because they do not change Signup and view all the answers

What is a control?

The measurements that are recorded as a basis for comparing the results Signup and view all the answers

Qualitative data doesn't use what?

Doesn't use numbers Signup and view all the answers

What is the scientific method in order?

<ol> <li>Make an observation 2. Identify the problem 3. Research the issue 4. State the hypothesis 5. Perform an experiment 6. Analyze data</li> </ol> Signup and view all the answers

What does 'look for same' refer to?

Constants Signup and view all the answers

The factor that is changed is known as the?

Independent variable Signup and view all the answers

Graphs are used for what?

To analyze data Signup and view all the answers

What can graphs be used for?

To establish patterns, interpolate, extrapolate Signup and view all the answers

Interpolate and extrapolate are examples of certain what?

Graphs Signup and view all the answers

What does 'inter' mean?

Between Signup and view all the answers

What does 'extra' mean?

Beyond Signup and view all the answers

Study Notes

Variables and Their Types

Variables are factors that can change during an experiment.
Two main types of variables exist: independent and dependent.
The independent variable is altered by the experimenter and is considered the "cause" in the cause and effect relationship.
The dependent variable is observed in response to changes in the independent variable and typically represents the "effect."

Characteristics of Independent and Dependent Variables

Only one independent variable is permitted in an experiment for clarity.
Multiple dependent variables can be observed simultaneously.
The dependent variable demonstrates the impact of the independent variable's modifications.
On a graph, the dependent variable is usually represented on the y-axis, while time is always placed on the x-axis.

Constants and Controls in Experiments

Constants are factors that remain unchanged throughout all experimental groups to ensure valid results.
Keeping constants stable is crucial to avoid skewing the experiment's outcomes.
Constants earn their name due to their unchanging nature during the course of the experiment.
Control measurements provide a baseline to compare experimental results against.

Data Types and Graphing

Qualitative data refers to non-numeric observations and descriptions.
Graphs play a significant role in analyzing data, identifying trends, and establishing relationships.
Graphs can be utilized to interpolate (predict within the data range) and extrapolate (predict beyond the data range).

Scientific Method Overview

The scientific method consists of several key steps:
- Make an observation
- Identify the problem
- Conduct research on the issue
- Formulate a hypothesis
- Perform an experiment
- Analyze the data collected

"Interpolate" means to estimate values within the existing range of data.
"Extrapolate" refers to extending findings beyond the observed data range.
Both interpolation and extrapolation are techniques used in graph analysis.

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Description

Test your knowledge on the key concepts of variables, constants, and controls used in experiments. This quiz covers fundamental definitions and types of variables to help reinforce your understanding of scientific experimentation. Perfect for students looking to master these essential terms!