MOCAS 100
A student places a piece of chocolate, a piece of sugar-free
butterscotch, and a pebble on the sidewalk and counts how
many ants are attracted to each over ten minutes. The student
does this for five days, and records the information in the following table.
Chocolate
Butterscotch
Pebble
Day 1
Day 2 Day 3 Day 4 Day 5
(Number (Number (Number (Number (Number
of Ants)
of Ants) of Ants)
of Ants) of Ants)
5
10
8
5
6
2
7
3
4
1
3
4
5
3
3
Why is it important that the student includes a pebble in the test?
a) Control groups help determine if results are random.
b) Replication shows that results are reliable.
c) Multiple trials increase the reliability of the results.
d) Repetition ensures consistency of results.