Experimental Design Mission

Your mission… For each of the following experiments write: 1.The independent variable 2.The dependent variable 3.A problem question/statement 4.A hypothesis 5. Control group

Experiment #1 So that I am not wasting money, I want to find out what kind of bone is my dog ’ s favorite. I buy five different bones and leave out his original bone; then I keep track of the amount of time my dog spends with each bone.

Dog Bone Answers 1.The independent variable- Different types of dog bones 2.The dependent variable- amount of time the dog spends with the bone 3.A problem question/statement- What is the effect of the different types of dog bones on the amount of time the dog spends with the bone? 4.A hypothesis- If the dog likes a certain type of bone given to him then the amount of time the dogs spends with the bone will increase. 5. Control group- The original bone

Experiment #2 A study is being conducted to find out if students who eat a healthy breakfast before school perform better academically. One group of students is given no breakfast. A second group is fed junk food, and a third group is fed a healthy breakfast. The students are then given a test.

Breakfast and Test Scores 1.The independent variable- The different types of breakfast consumed 2.The dependent variable- test scores 3.A problem question/statement- What is the effect of the different types of breakfast consumed by students on their test scores? 4.A hypothesis- If a student eats a healthy breakfast then their test scores will increase. 5. Control group- No breakfast

Experiment #3 While baking cookies I notice that the bottom of my cookies are burning and the tops of the cookies are still mushy. I want to see if changing the type of cooking pan will make my cookies come out better. For one batch I use the same pan as always, for the second I use one that is nonstick, and for the third I line it with aluminum foil.

Cookies 1.The independent variable- Different types of cookie pans 2.The dependent variable- the taste and form of the cookies 3.A problem question/statement- What is the effect of the different types of cookie pans on the taste and form of the cookies? 4.A hypothesis- If the pan lined with aluminum foil is used then the taste and form of the cookies will increase in satisfaction. 5. Control group- The original pan

Warm up Question What is the difference between a control and a constant? A constant is something that stays the same throughout the lab. The control group is the part of the lab that we use to compare our results to! No changes are made to the control in the lab! (Usually the original) Why is the control important in a lab? It allows us to compare the variables in the lab!

Air Freshener Experiment #4 I see a commercial on T.V. that claims this product removes bad odors better than any other. I decide to try the product and see if it really works on bad odors. For the first week I use Febreeze, for the second I use Oust, for the third week I use Glade plug-in and for the fourth week, unfortunately I use nothing.

The Stink- Eliminator Experiment 1.The independent variable- Different types of air freshener 2.The dependent variable- the amount of odor removed 3.A problem question/statement- What is the effect of the different types of air freshener on the amount of odor removed? 4.A hypothesis- If the air freshener used is Febreeze then the amount of odor removed will increase. 5. Control group- No air freshener

Warm up Question What is the difference between a control and a constant? Please give an example of each from the different labs we did in class. (Airplane, pepper, dog bones, baking pans)

Writing a conclusion to an experiment… A conclusion is how you will share the overall results of your experiment. Every conclusion needs to have the following FIVE items… 1.The PURPOSE of the experiment 2.The HYPOTHESIS 3.What the data showed (results statement) 4.Data (numbers) to support the results statement. (use at least 3 examples) 5. If the data supported, did not support, or was not clear about the hypothesis.

Writing a PURPOSE… Use the formula: The purpose of the experiment was to determine the effect of the (I.V.) on the (D.V.).

Pepper Lab Data Type of fertilizer (I.V)Size of Peppers (D.V.) Cow poop4 inches Miracle Grow1 inch Nitrogen2 inches Nothing6 inches Compost5inches

Pepper Conclusion Example Title-The Pepper Experiment 1. The purpose of the experiment was to determine the effects of the different fertilizers on the size of the peppers. 2. My hypothesis was if I use cow poop, then my peppers will increase in size. 3. The data showed that although cow poop perppers did grow the group with nothing grew more. 4. The data showed that with cow poop the peppers grew to 4 inches but with nothing they grew to 6 inches. Cow poop peppers did grow more than the group with miracle grow to 1 inch. 5. The data did NOT support my hypothesis.

Breakfast Lab Type of BreakfastTest Scores No Breakfast72% Junk Food84.3% Healthy breakfast94.5% Write a conclusion for the Breakfast Lab using this data. I.V. types of breakfast D.V. test scores

Breakfast Conclusion The purpose of this experiment was to determine the effect of the different types of breakfasts on the test scores. My hypothesis was that if I eat a healthy breakfast then my test scores will increase. The students who ate a healthy breakfast scored the best. The data showed that with no breakfast the test scores averaged a 72%, but with a healthy breakfast test scores averaged a 94.5%. The data did support my hypothesis.

Air freshener Lab Type of Air FreshenerDays of smelling good Febreeze4 days out of a week Oust6 days out of a week Glade Plug-in2 days out of a week Nothing0 days out of a week Write a conclusion for the air freshener Lab using this data. I.V. types of air fresheners D.V. days the room smelled good

Air freshener Conclusion The purpose of this experiment was to find the effect of the different types of air fresheners on the amount of days the room smelled good. My hypothesis was that if I use frebreeze then stink of the room would decrease. The data showed that with no air freshener there were zero days of smelling good, but with frebreeze the room smelled good for four days. The data did support my hypothesis.

Flatulence Experiment The crazy science department wanted to see what types of food would make them the most gassy. First they tried bake beans. The next day they tried broccoli. The following day they tried cabbage. They also took data without eating any food.

YOUR MISSION….. For each of the following experiments write: 1.The independent variable 2.The dependent variable 3.A problem question 4.A hypothesis 5. Control group

The Data (copy this down) Types of Food Amount of Flatulence No Food13 Flatulence Baked Beans41 Flatulence Broccoli34 Flatulence Cabbage26 Flatulence

Flatulence Experiment IV- The type of food eaten DV- The amount of Flatulence Problem Question- What is the effect of the type of food eaten on the amount of Flatulence ? Hypothesis- If the type of food eaten is baked beans then the amount of Flatulence will increase. Control Group- No food

YOUR MISSION…. Write the conclusion for the Flatulence experiment. Every conclusion needs to have the following FIVE items… 1.The PURPOSE of the experiment 2.The HYPOTHESIS 3.What the data showed (results statement) 4. Data (numbers) to support the results statement. Remember to use two examples. Maximum and minimum. 5. If the data supported, did not support, or was not clear about the hypothesis.

Flatulence Experiment Conclusion The purpose of this experiment was to find the effect of the different types of food eaten on the amount of Flatulence produced. The hypothesis was that if the food eaten was baked beans that the amount of Flatulence produced would increase. The data showed that any food increased the amount of farts.The data showed that with no food the amount of Flatulence was 13, but with the use of baked beans the Flatulence increased to 41. There was an increase of 28 Flatulence. The data supported the hypothesis.

CaCl 2 Experiment Conclusion The purpose of this experiment was to find out the effect of different amounts of CaCl 2 on the temperature of the water. My hypothesis was if the amount of Cacl 2 is increased then the temperature of the water will increase. The data showed that the temperature did increase. At 0 scoops of CaCl 2 the temperature was 20.4 o Celsius. When I added one scoop it was 21.2 o, 2 scoops 22.3 o and the temperature continued to increase. The data supported my hypothesis.