Unit 3 Flashcards
What is an Independent Variable?
The thing you’re changing in your experiment
What is a Dependant Variable?
The thing you are measuring in your experiment
What is a Control Variable?
The thing you keep the same throughout your experiment
What is a Hazard?
Something that can cause Harm to someone, Damage to something, or have Adverse health effects
What is a Risk?
How harm can be caused
What is risk prevention?
How to work safely with a Hazard
What is an Irritant?
Something that can cause itching or burning
What is Resolution?
The smallest change of measurement that can be detected in measuring equipment
What is Uncertainty?
+/- Half the resolution of the measuring instrument
What is a Hypothesis?
A prediction, based on scientific ideas, made as a starting point for further investigation.
When is the Chi-Squared Test used?
When an investigation involves collecting data about the number of individuals in particular categories
What is the Chi-Squared Equation?
Sum of ((O-E)^2))/E
How do you work out Degrees Of Freedom?
No. of Classes - 1
When do you Accept the Null Hypothesis?
When the answer is Lower than the Null Hypothesis
When do you Reject the Null Hypothesis?
When the answer is Higher or the Same as the Null Hypothesis
