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Questions and Answers
What is a type of variable that has either nominal or ordinal level of measurement?
What is a type of variable that has either nominal or ordinal level of measurement?
- Quantitative
- Discrete
- Categorical (correct)
- Continuous
In an experiment, what is the variable that is manipulated called?
In an experiment, what is the variable that is manipulated called?
- Independent variable (correct)
- Dependent variable
- Extraneous variable
- Control variable
Which variable may influence or confuse the relationship between variables under study?
Which variable may influence or confuse the relationship between variables under study?
- Dependent variable
- Confounding variable (correct)
- Moderating variable
- Independent variable
What is the dependent variable in Akhan's investigation measuring the energy stored in different types of crisps?
What is the dependent variable in Akhan's investigation measuring the energy stored in different types of crisps?
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Which statement about characteristics that change is correct?
Which statement about characteristics that change is correct?
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Study Notes
Variables in Scientific Investigations
- Changing qualities or characteristics of subjects are referred to as variables, including attributes such as age and gender.
- Variables can be categorized into different types such as continuous, discrete, nominal, and ordinal levels of measurement.
Types of Variables
- Continuous Variables: Able to take on an infinite number of values within a given range.
- Discrete Variables: Consists of distinct, separate values, often counted in whole numbers.
Experimental Design
- In a scientific investigation measuring energy in crisps:
- Dependent Variable: The aspect that is measured or affected during the experiment (e.g., amount of energy in different types of crisps).
- Independent Variable: The factor that is manipulated or changed (e.g., types of crisps used).
Roles of Variables
- Manipulated Variable: The independent variable, which is intentionally altered to assess its effect on the dependent variable.
- Confounding Variable: Any variable that may influence or obscure the relationship between the independent and dependent variables, potentially leading to inaccurate conclusions.
Quote on Knowledge
- "Knowledge is of no value unless you put it into practice." - Anton Chekhov.
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