Question

question 10 of 10
which option is an example of an experiment?
a. counting the number of times a number cube rolls a 5
out of 30 tries
b. finding the number of red jellybeans in an average jar of
jellybeans by counting
c. testing the effectiveness of a mouthwash by allowing
one group to use it and comparing the results with
those of a group that doesnt use it
d. having customers fill out a questionnaire about their
favorite brand of toothpaste

Explanation:

Step1: Understand the concept of an experiment

An experiment involves manipulating a variable (in this case, the use of mouthwash) and comparing the results between different groups (the group using mouthwash and the group not using it).

Step2: Analyze each option

• Option A: Counting the number of times a number cube rolls a 5 out of 30 tries is an example of a probability - related observation, not an experiment with a manipulated variable.
• Option B: Finding the number of red jellybeans in an average jar of jellybeans by counting is a simple counting task, not an experiment.
• Option C: Testing the effectiveness of a mouthwash by having one group use it and comparing with a non - using group is an experiment as it has a treatment (using mouthwash) and a control (not using mouthwash) group.
• Option D: Having customers fill out a questionnaire about their favorite brand of toothpaste is a survey, not an experiment.

Answer:

C. Testing the effectiveness of a mouthwash by allowing one group to use it and comparing the results with those of a group that doesn't use it