Question

match the word to the definition write the letter on the line
6 _ scientific inquiry
a this group shows the effect of the variable being tested
7 _ hypothesis
b this is the one variable that is changed
8 _ control group
c a well - tested explanation for experimental results
9 _ experimental group
d the many ways in which scientists study the natural world
10 _ independent variable
e a possible answer to a scientific question
11 _ dependent variable
f this describes an observed pattern in nature
12 _ scientific theory
g this group is left alone and not experimented on
13 _ scientific law
h this is the variable that gets measured
identifying
read through the following scenarios identify the control group, the experimental
group, the independent variable, and the dependent variable
a company wants to test a new dog food that
is supposed to help overweight dogs lose
weight 50 dogs are chosen to get the new
food, and 50 more continue their normal diets
after one month, the dogs are checked to
see if they lost any weight
a new sunscreen has been developed that is
supposed to be more effective at preventing
sunburn 30 participants spray one arm with
the new formula, and spray the other arm
with the leading formula after 4 hours in the
sun, their skin is evaluated for any redness
a student wants to study the effect of sunlight
on plant growth in his experiment, 12 plants
receive normal amounts of sunlight, but half of
them are kept under bright sun lamps all night
long after 6 weeks, the plants heights are
measured

Explanation:

• Scenario 1:
• Independent Variable: The type of dog food (new vs normal) is what is being changed.
• Dependent Variable: The weight of the dogs is what is being measured.
• Experimental Group: The 50 dogs getting the new food are the group with the variable being tested.
• Control Group: The 50 dogs continuing their normal diets are the group left alone (not having the new variable).
• Scenario 2:
• Independent Variable: The type of sunscreen formula (new vs leading) is the variable being changed.
• Dependent Variable: The redness of the skin is what is being measured.
• Experimental Group: The arms with the new formula are the group with the variable being tested.
• Control Group: The arms with the leading formula are the group with the standard (not new variable).
• Scenario 3:
• Independent Variable: The amount of sunlight (normal vs extra at night) is the variable being changed.
• Dependent Variable: The height of the plants is what is being measured.
• Experimental Group: The plants under bright sun lamps all night are the group with the variable being tested.
• Control Group: The plants with normal sunlight are the group left alone (not having the extra sunlight variable).

Answer:

1. Type of dog food
2. Dog's weight
3. 50 dogs getting new food
4. 50 dogs with normal diets
5. Type of sunscreen formula
6. Skin redness
7. Arms with new formula
8. Arms with leading formula
9. Amount of sunlight
10. Plant height
11. Plants under bright sun lamps all night
12. Plants with normal sunlight