Independent and Dependent Variables Wed Aug 29th

Purposes – (you already have these) Content: identify variables (dependent and independent), and controls Language: Compare and contrast dependent and independent variables using the sentence frames: “Independent variables are similar to dependent variables because .” “Independent variables are , whereas dependent variables are .” PWG Outcome: Partners identify dependent and independent variables, discuss the similarities and differences

PDF Files for printshop\spongebobPDF.pdf Resource WS/ HW: SpongeBob and Friends Use the Scientific Method

Determining Dependent and Independent variables Independent Variable - Variable in an experiment that is changed or manipulated. I.V. - The amount of time spent in the sun Dependent Variable - The variable in an experiment that responds to the change and is measured. D.V. - Getting a sunburn

Today is Dependent and Independent Variable day

1 - Patty Power Which people are in the control group? Mr. Krabbs wants to make Bikini Bottoms a nicer place to live. He has created a new sauce that he thinks will reduce the production of body gas associated with eating crabby 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. Which people are in the control group? What is the independent variable? What is the dependent variable? What should Mr. Krabs’ conclusion be? Why do you think 8 people in group B reported feeling better?

Patty power Which people are in the control group? What is the independent variable? What is the dependent variable? What should Mr. Krabs’ conclusion be? Why do you think 8 people in group B reported feeling better?

CONTROL GROUP Which people are in the control group? Group B

Who is in the experimental group? Group A

Independent Variable What is the independent variable? The new sauce http://home.fuse.net/skycorder/sponge/thelid5.WAV

Dependent Variable What is the dependent variable? Amount of gas

What should Mr. Krabs’ conclusion be What should Mr. Krabs’ conclusion be? The new sauce appears to work as it reduced the amount of gas produced in 60% of the people tested.

Patty power Why do you think 10 people in group B reported feeling better? They thought they were getting the new sauce as a result thought that they didn’t have as much gas. (Placebo effect)

Placebo Effect

How could we change our hypothesis to provide for a more scientific experiment? Measure using quantitative data versus qualitative data. Vocabulary: Quantitative Data: uses numbers and measurements Qualitative Data: uses 5 senses to observe

Slimtosis 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 the 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 1 week and having him drink Dr. Kelp. After a week of treatment, the slime is gone and Gary’s shell smells better. DrKelp

Slimotosis What was the initial observation? Slimotosis on Gary’s shell

What is the independent variable? What do “I” Change? Cures (Seaweed and Dr. Kelp) http://home.fuse.net/skycorder/sponge/meow.wav

Slimotosis What is the dependent variable? Slime and odor

2 – Slimotosis What should Sponge Bob’s conclusion be? Although Gary’s symptoms have disappeared, it is not known which cure was the one that worked. He should redo the experiment and include a control group as well as two other testing groups for each of the proposed cures.

Let’s look in our book and put away our homework in our “Home folder Turn to pg 21 to the “ICEMAN” The rest of this worksheet is due next Thursday

Lesson for today Scientific_Method new.flipchart Go to page 8 of flip chart PDF Files for printshop\spongebobPDF.pdf PDF Files for printshop\Spongebob2.pdf Up Front, Consumer Reports article on “best paper towels”

With your partner, use the sentence frames below to compare and contrast I.V. and D.V. “Independent variables are similar to dependent variables because .” “Independent variables are , whereas dependent variables are .”

Paper Towel article What did scientists test for the paper towels? 1. 2. 3. Which brand of paper towels scored best overall in terms of performance in these three categories? The worst?

Finding Independent and Dependent Variables: If we were testing “Absorption”, using the method described here, what were the independent variables? ________________ dependent variables? ________________ Scientific_Method new.flipchart Use the Chart (pg 8) that you copied into your notebook to determine. Hint 2: Read back through paragraph 2 to see what “I (the scientist) changed” and what “was measured”

Finding Independent and Dependent Variables Answer: If we were testing “Absorption”, using the method described here, what were the: independent variables? _type of paper towel__ dependent variables? __weight of water that a 25- square inch piece of paper towel could hold___ Did the scientists use qualitative or quantitative data? What would be some controls of this experiment?

Finding Independent and Dependent Variables: If we were testing “Scrubbing”, using the method described here, what were the independent variables? ________________ dependent variables? ________________ Scientific_Method new.flipchart Use the Chart (pg 8) that you copied into your notebook to determine. Hint 2: Read back through paragraph 2 to see what “I (the scientist) changed” and what “was measured”

Finding Independent and Dependent Variables Answer: If we were testing “Scrubbing”, using the method described here, what were the: independent variables? _type of paper towel__ dependent variables? __the number of strokes needed to tear a section of wet paper towel rubbed over a mildly abrasive surface___ Did the scientists use qualitative or quantitative data? What would be some controls of this experiment?

On your paper write the following “Independent variables are similar to dependent variables because .” “Independent variables are , whereas dependent variables are .”

Assignment This week we will be creating an experiment from beginning to end. You will be following the steps of scientific inquiry (the scientific method). Homework: Study the vocabulary terms and be able to identify variables and all parts of an experiment