This is a presentation about fair and unfair testing for grade 4 students

1. Fair and unfair testsFair and unfair tests
(experiments)(experiments)

2. For Example:For Example:

3. I took 6 sunflower seedsI took 6 sunflower seeds

4. I planted 3 seeds in each pot.I planted 3 seeds in each pot.
The pot was the same kind andThe pot was the same kind and
had the same amount of soil.had the same amount of soil.

5. I chose to water one pot andI chose to water one pot and
leave the other one. I left themleave the other one. I left them
both in the sun.both in the sun.

6. I kept doing that for a month.I kept doing that for a month.
After a month…After a month…

7. Was this test fair?Was this test fair?
 Yes, it was.Yes, it was.
 Why?Why?
 Because I kept all factors the same likeBecause I kept all factors the same like
(Same number and kind of seeds in each(Same number and kind of seeds in each
pot- kept them both in the sun- samepot- kept them both in the sun- same
amount of soil)amount of soil)
 I only changed one factor (the factor that II only changed one factor (the factor that I
want to test) which is the light.want to test) which is the light.

8. Students of different agesStudents of different ages
were given the same jigsawwere given the same jigsaw
puzzle to put together.puzzle to put together.
They were timed to see howThey were timed to see how
long it took to finish thelong it took to finish the
puzzle.puzzle.

9. Students of different agesStudents of different ages
(different age)(different age)

10. Same jigsaw puzzelSame jigsaw puzzel

11. Was this test fair?Was this test fair?
 Yes, it was. Because I changed only oneYes, it was. Because I changed only one
factor and kept the rest the same.factor and kept the rest the same.
 Can you tell me, how you can change itCan you tell me, how you can change it
to be unfair?to be unfair?
 By changing more than one factor, likeBy changing more than one factor, like
changing the jigsaw puzzle and the ageschanging the jigsaw puzzle and the ages
of the students.of the students.

12. One more:One more:

13. The more time I give anThe more time I give an
egg to boil, the moreegg to boil, the more
cooked it is.cooked it is.

14. What is the thing I chose toWhat is the thing I chose to
change?change?

15. What is the thing I kept theWhat is the thing I kept the
same?same?

16. What is the thing I measured?What is the thing I measured?

17. Fair testFair test
 I only changed the time I gave the eggs toI only changed the time I gave the eggs to
boil.boil.
 I kept the same kind of eggs.I kept the same kind of eggs.
 I used the same temperature to boil them.I used the same temperature to boil them.