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Scientific Method Review Worksheet

Write answers on a separate sheet of paper. Turn in at the end of the hour worth 10pts.

Read the following and answer the questions below:

Mythbuster Investigation:

Our dynamic duo heard rumors that toothbrushes sitting out in a bathroom collect bacteria that fly through the air when the toilet is flushed. They designed a simple yet fair experiment. They placed a toothbrush in an exposed area on the sink in a bathroom. In addition to the exposed toothbrush, these eager investigators kept another identical toothbrush in a closed container. One person only removed it to brush his teeth each morning. After he was finished, he returned the second toothbrush to the sealed container. He was sure to brush his teeth the same amount of time with each toothbrush.

During the day, the toilet in the bathroom was used as normal. After two weeks of normal bathroom and toothbrush usage, a microbiologist was called in to measure the amount of coliform bacteria on the exposed and unexposed toothbrushes.

In this experiment, identify the following:

A. the observation they wanted to explain:

B. the hypothesis:

C. the independent variable:

D. the dependent variable:

E. 2 controlled variables (aka "constants"):

F. a source of error

Sponge Bob:

The Bikini Bottom gang loves science class and wanted to do a little research. Read the description for each experiment and use your knowledge of the scientific method to answer the questions.

Scenario 1: FLOWER POWER

SpongeBob loves to garden and wants to grow lots of pink flowers for his pal Sandy. He bought a special Flower Power fertilizer to see if it will help plants produce more flowers. He plants two plants of the same size in separate containers with the same amount of potting soil. He places one plant in a sunny window and waters it every day with fertilized water. He places the other plant on a shelf in a closet and waters it with plain water every other day.

1. What did SpongeBob do wrong in this experiment?

Explain.

2. What should SpongeBob do to test the effectiveness of Flower Power fertilizer? Write an experiment.

The Bikini Bottom gang loves science class and wanted to do a little research. Read the description for each experiment and use your knowledge of the scientific method to answer the questions.

Scenario 2: Super Snails

Gary is not the smartest snail in Bikini Bottom and believes he can improve his brain power by eating Super Snail Snacks. In order to test this idea, he recruits SpongeBob and several snail friends to help him with the experiment. The snails ate one snack with each meal every day for three weeks. SpongeBob created a test and gave it to the snails before they started eating the snacks as well as after three weeks.

[pic]

1. Based on the data in the data table, do Super Snail Snacks work? Explain your answer.

2. What's wrong with the data table (in terms of "format issues")?

The Bikini Bottom gang loves science class and wanted to do a little research. Read the description for each experiment and use your knowledge of the scientific method to answer the questions.

Scenario 3: BUBBLE TIME!

Patrick loves bubble gum and would like to be able to blow bigger bubbles than anyone else in Bikini Bottom. To prepare for the Bikini Bottom Big Bubble Contest, he bought five different brands of bubble gum and needs your help to find the brand that creates the biggest bubbles.

1. Write an experiment to test the bubble power of the bubble gum brands and help Patrick win the contest.

Scenario 3: BUBBLE TIME! (continued)

Now let's assume following your expert experimental plan, the following results were seen:

TYPE OF GUM Size of bubble[pic]

1. What is the mean of the data?

2. What is the mode of the data?

3. What is the median of the data?

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