1. Writing a testable hypothesis

2. What observations did you make about the koi fish?

3. Starts with observations. Observations turn into questions.

4. A hypothesis … a complete sentence
an educated guess based on an observation or prior knowledge
includes an explanation of why a guess may be correct
is testable
AKA a claim

5. Hypothesis have 3 parts IF What is being done to test the question
THEN
Prediction of what will occur
BECAUSE
Justifies why it occurred

6. Writing a hypothesis
Question: What will happen to potatoes when soaked in water?
Potatoes soaked in water overnight will increase in size because water is entering the potatoes cells via osmosis.
If, then, because?
Testable?

7. Testing a hypothesis Experiment Investigation
Cause & effect relationships
Has a control, independent variable, & dependent variable
Investigation
Question driven
Doesn’t have to have a hypothesis

8. A procedure is… a set of steps in a experiment or investigation
used to collect evidence to evaluate a claim
detailed enough that another person could replicate it

9. Procedures often have a…
Control group
Independent variable
Dependent variable

10. Parts of a procedure Variable- what is being measured Types:
Ex: height, weight, time, reactivity etc.
Types:
Independent variable- variable that stands alone & isn’t change by other variables being studied
Examples: time, age
Dependent variable- variable that changes based on other factors
Examples: height, weight

11. Practice
SpongeBob Clean Pants SpongeBob noticed that his favorite pants were not as clean as they used to be. His friend Sandy told him that he should try using Clean-O detergent, a new laundry soap she found at Sail-Mart. SpongeBob made sure to wash one pair of pants in plain water and another pair in water with the Clean-O detergent. After washing both pairs of pants a total of three times, the pants washed in the Clean –O detergent did not appear to be any cleaner that the pants washed in plain water.

12. How to determine if a hypothesis is valid
Data supports
the THEN statement
of the hypothesis
Repeat experiment or
investigation and
get same results