Warm Up – Page 18• Define the following terms:– Manipulated variable – – Responding variable –

• Copy down tonight’s homework.• Volunteer to pass back lab safety posters – go

on page 14

Group # Total # of

M&M’s

# of Green

M&M’s

# of Brown M&M’s

# of Yellow M&M’s

# of Orange M&M’s

# of Blue M&M’s

# of Red M&M’s

1

2

3

4

5

6

7

8

9

10

11

12

13

14

Analyze Data• What is the mean number of M&M’s for each

group?– Total:– Green:– Brown:– Yellow:– Orange:– Blue:– Red:

Conclusions• What can you conclude from your

investigation? Write at least one paragraph communicating your results.

Bikini Bottoms Experiments

Scientific Investigations Practice

Slimotosis• Sponge Bob notices that his pal Gary is

suffering from slimotosis, which occurs when the shell develops a nasty slime and gives off a horrible odor. His friend Patrick tells him that rubbing seaweed on the shell is a perfect cure, while Sandy says that drinking Dr. Kelp will be a better cure. Sponge Bob decides to test this cure by rubbing Gary with seaweed for one week and having him drink Dr. Kelp. After a week of treatment, the slime is gone and Gary’s shell smells better.

Slimotosis• What is the independent (manipulated)

variable?• What is the dependent (responding) variable?• What should Sponge Bob’s conclusion be?• What is wrong with this experiment?

Marshmallow Muscles• Larry was told that a certain muscles cream

was the newest best thing on the market and claims to double a person’s muscle power when used as a part of a muscle-building workout. Interested in this product, he buys the cream and recruits Patrick and Sponge Bob to help him with an experiment. Larry develops a special weight-lifting program for Patrick and Sponge Bob. He meets with them once a day for a period of two weeks and keeps track of their results. Before each session, Patrick’s arms and back are lathered in muscle cream, while Sponge Bob’s arms and back are lathered with regular lotion.

Marshmallow Muscles• Which person is in the

control group?• What is the

independent (manipulated) variable?

• What is the dependent (responding) variable?

• What should Larry’s conclusion be?

Time Patrick Sponge Bob

Initial Amount

18 5

After 1 Week

24 9

After 2 weeks

33 17

Krusty Krabs Breath Mints• Mr. Krabs created a secret ingredient for a

breath min that he thinks will “cure” the bad breath people get from eating crabby patties at the Krusty Krab. He asked 100 customers with a history of bad breath to try his new breath mint. He had 50 customers (Group A) eat a breath min after they finished eating a crabby patty. The other 50 (Group B) also received a breath min after they finished the sandwich, however, it was a regular mint without the secret ingredient. Both groups were told they were getting the special breath mint. Two hours after eating the crabby patties, 30 customers in Group A and 10 customers in Group B reported having better breath than they normally had after eating crabby patties.

Krusty Krabs Breath Mints

• Which people are in the control group?• What is the independent (manipulated)

variable?• What is the dependent (responding) variable?• What should Mr. Krab’s conclusion be?• Why do you think 10 people in Group B

reported fresher breath?

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 Bubble Contest, he bought five different brands of bubble gum and needs your help to find the brand the creates the biggest bubbles. Write and experiment to test the bubble power of the gum brands and help Patrick win the contest!

Make Sure You Know• Observations, Inferences, Predictions,

Classifying, Models and Simulations, Communicating – what they are and be able to identify examples

• Metric system – tools, units, and prefixes• Lab safety rules• Scientific method – steps and be able to

identify variables