READ THIS STORY AND ANSWER THE QUESTIONS:

Joe baked a cake for his mother's birthday. When the cake was taken from the oven Joe noticed that the cake had not risen. Joe guessed that the oven had not heated to the right temperature. He set up this experiment to test his idea. First, Joe put a thermometer in the oven. He then turned the oven dial to 350 degrees C. He noticed that the preheating light came on when he turned the oven on. He waited until the preheating light went out. The light's going out indicated that the oven was up to temperature. Joe then read the thermometer within the oven. It read 350 degrees C.

Joe concluded that the oven was working correctly.

1. Circle Joe's hypothesis.

2. Underline Joe's conclusion.

3. List Joe's observations.

A) ________________________________________________

B)_______________________________________________

C)_______________________________________________

D)_______________________________________________

4. Below are several statements about the story. Place an "X" by those that are

observations.

____A. Joe thought that the cake recipe was good.

____B. The preheating light came on when the oven was turned on.

____C. The cake was tasty.

____D. The cake was for Joe's mother's birthday.

____E. The cake did not rise.

5. After Joe concluded that the oven was working, did he determine that his

hypothesis was correct or incorrect? ___________________

6. What step of the scientific method should Joe do next?

Mr. Krabbs wants to make Bikini Bottom a nicer place to live. He has created a new sauce that he thinks will reduce the production of body gas caused by eating Krabby Patties from the Krusty Krab. He recruits 100 customers with a history of gas problems. He has 50 of them (Group A) eat crabby patties with the new sauce. The other 50 (Group B) eat crabby patties with sauce that looks just like new sauce but is really just mixture of mayonnaise and food coloring. Both groups were told that they were getting the sauce that would reduce gas production. Two hours after eating the crabby patties, 30 customers in group A reported having fewer gas problems and 8 customers in group B reported having fewer gas problems. 

What is the problem that Mr. Krabbs is trying to figure out?

What is the variable in the experiment?

Which group is used as the control?

How do you know?

 What should Mr. Krabs’ conclusion be?  Use data to back up your answer.