Download practice: identifying variables - Dr. Vernon-

Name: ________________________________________ Period: ______ Date: __________________________
PRACTICE: IDENTIFYING VARIABLES
Identify the manipulated variable, responding variable, controlled variables, control group and experimental group. Possible
sources of inherent error?
An investigator spills dye on a culture plate and notices that the bacteria live despite exposure to sunlight. He decides to test if
the dye is protective against ultraviolet light. He exposes one group of culture plates containing bacteria and dye and another
group containing only bacteria to UV light. The bacteria on all plates die.
You want to grow large tomatoes and notice that a name-brand fertilizer claims to produce larger produce than a generic brand.
How would you test this claim?
A scientist wishes to test her hypothesis that a commonly used drug causes heart attacks in some individuals. What kind of
study should she initiate? What would you expect her experimental and responding variables to be?
Name: ________________________________________ Period: ______ Date: __________________________
PRACTICE: IDENTIFYING VARIABLES
Identify the manipulated variable, responding variable, controlled variables, control group and experimental group. Possible
sources of inherent error?
An investigator spills dye on a culture plate and notices that the bacteria live despite exposure to sunlight. He decides to test if
the dye is protective against ultraviolet light. He exposes one group of culture plates containing bacteria and dye and another
group containing only bacteria to UV light. The bacteria on all plates die.
You want to grow large tomatoes and notice that a name-brand fertilizer claims to produce larger produce than a generic brand.
How would you test this claim?
A scientist wishes to test her hypothesis that a commonly used drug causes heart attacks in some individuals. What kind of
study should she initiate? What would you expect her experimental and responding variables to be?