Directly proportional means that...
  • as X increases, Y increases in proportion giving a straight line graph
  • as X increases, Y decreases
  • as X increases, Y increases a small amount
  • As X increases, Y increases greatly
What is the dependent variable in the prediction " ?
  • pH
  • Decrease
  • Increase
  • Number of bubbles
What is an independent variable in a scientific experiment?
  • A factor which never changes
  • A factor which changes
  • A factor whose values are changed or selected by the investigator
  • A factor which must always be kept the same
Causal implies that...
  • X caused Y to increase
  • An unknown factor caused Y to increase
  • Z was involved
  • Other factors were involved
How many different types of variables are there?
  • One
  • Two
  • Three
  • Four
As X increases, Y increases demonstrates a...
  • negative correlation
  • positive correlation
  • causal relationship
  • association relationship
The dependent variable is...
  • the factor we change
  • the factor we control
  • the factor we measure
  • the X factor
An association is not the same thing as a causal relationship because...
  • causal means one thing has definitely influenced the outcome
  • causal means other factors could have caused the outcome
  • association means they are connected by lots of factors
  • association is not relevant
The key independent variable is...
  • the factor we change
  • the factor we keep the same
  • the factor we measure
  • the factor we ignore
Which is the key independent variable of the hypothesis " "?
  • Collisions
  • Number of bubbles
  • Rate
  • Temperature
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