Hypothesis??

Hypothesis: - It is an educated guess or

prediction- It is an “if, then” statement- Keep you and I out of it

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

An “if” “then” Statement

If ____independent variable______,

then__dependent variable_______.

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

Types of Variables

Example: Independent Variable:

the cat is feed a lot of foodDependent Variable

he will get fat

If ___________________________then _________________________

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: ____________________________________

A soap manufacturer wants to prove that their detergent works better to remove tough stains. What is the dependent variable?A.Removal of stainB.Detergent

A scientist studying bugs wants to determine if temperature changes how many times a cricket chirps. What is the dependent variable?A.Number of times a cricket chirpsB.Temperature

You think that a certain part of your brain is important in memory. To test this, you will remove this part of the brain from rats and see if they remember how to get through the maze. What is the dependent variable in this experiment? A)Remembering how to get through the maze.B)Removal of a certain part of the brain.

You want to see if playing music makes plants grow taller. What is the dependent variable in this experiment?A.Height of plantB.Music being played

You want to measure the effect of different amounts of oxygen on the rate of yeast growth. What is the independent variable?A.Amount of oxygenB.Rate of yeast growth

You want to test a new drug that supposedly prevents sneezing in people allergic to grass. What is the independent variable?A.SneezingB.GrassC.Drug

A florist wants to see if Product X will extend the life of cut flowers so that they last longer. What is the dependent variable?A.Life of the flowersB.Adding Product X