Friday, September 9, 2011 Please follow the procedure for entering the room. Take out your Simpsons worksheet (homework from last night) and place it on your desk. *NOW IS NOT THE TIME TO DO IT!* Copy today’s “I can” statement. Fill out your agenda. Remember CHAMPs expectations! Thank you!

HypothesisHypothesis

Step 2: Form a Hypothesis Hypothesis: an educated guess or prediction; an “if, then” statement If ____ independent variable ______ then__ dependent variable _______

Example: Independent Variable: I feed my cat a lot of food Dependent Variable she will get fat If ___________________________ then _________________________

Remember Try to use INCREASE and DECREASE in your hypothesis! Ex. IF I increase the amount of food I give my cat, THEN she will increase her weight

Now Try it on Your Own! ‘Writing a Good Hypothesis” Just ‘plug and chug’ in your variables!

Identifying Variables

Types of Variables There are 2 main types of variables: Independent Variable: The variable that is changed by the scientist; the ‘I control’ variable Dependent Variable: The variable that might change because of what the scientist changes – what is being measured

Remember! Your hypothesis can TELL you what your variables are! Ex. If I drink Mountain Dew before bed, then I will not sleep very much. IV: Drinking Mountain Dew DV: the amount of sleep

Practice Use this hypothesis to identify the variables: If I leave all the lights on all day, then my electric bill will be expensive IV: ______________________ DV: ______________________

If I brush my cat more, then there will be less fur on my furniture IV: ______________________ DV: ______________________

Now read the following experiment and identify the independent and dependent variables Elizabeth wanted to test if temperature affected how fast milk goes bad and curdles. She left milk in a room temperature closet, a fridge, and a oven that was turned on low heat. She then measured how rotten the milk was after 10 days. IV: ____________________________________ DV: ____________________________________

Practice Time! Try the first page in your packet.

HypothesisHypothesis

Step 2: Form a Hypothesis Hypothesis: an educated guess or prediction; an “if, then” statement If ____ independent variable ______ then__ dependent variable _______

Example: Independent Variable: I feed my cat a lot of food Dependent Variable she will get fat If ___________________________ then _________________________

Remember Try to use INCREASE and DECREASE in your hypothesis! Ex. IF I increase the amount of food I give my cat, THEN she will increase her weight

Now Try it on Your Own! (2 nd page in packet) ‘Writing a Good Hypothesis” Just ‘plug and chug’ in your variables!

Constants and Controls

Constant Constant: something that scientist makes sure is the same throughout the experiment Ex. Watering the plants the same amount of water or making sure you are testing the same person every time

Control Control: The part of the experiment that the scientist doesn’t change or add the variable to Ex. The plant with the white light

Conclusion The results of the experiment; is your hypothesis “right or wrong”?

Smithers 1.Control: Group B 2.Independent Variable: recipient of special juice 3.Dependent Variable: stacks of papers 4.Conclusion: The special juice does not increase the productivity of workers. 5.Improvements:

Homer 6.Observation: shower is covered in green slime 7.Control: water side 8.Independent Variable: coconut juice side 9.Dependent Variable: appearance of the green slime 10.Conclusion: Coconut juice does not get rid of the green slime.

Bart 11.Control: mice not exposed to radiowaves 12.Independent Variable: Exposure to radiowaves 13.Dependent Variable: Strength 14.Conclusion: Exposure to radiowaves may have an impact on allowing mice to become stronger. 15.Improvements:

Krusty 16.Control: old itching powder 17.Independent Variable: Experimental itching powder 18.Dependent Variable: amount of time itching 19.The data does support the advertisement claims about the products.

Ender What is one question about the content we’ve covered so far that you need answered before next week’s test? NOTE: You may ask more than one if necessary!