Experimental Design
How many trials should we have in an experiment?
At least 3
What is another SCIENCE word for hypothesis?
prediction
"Janet is the best student when it comes to playing soccer" is an _____________
opinion
Is it okay to change data for any reason?
NO!
Give an example of something that is testable
varies
Why should we have multiple trials
To improve the reliability of the data
Procedures
The apple without lime or orange juice had the most chemical change is an ______________.
observation
Is it okay for data to come out not as expected? Why or why not?
Yes, because data we did not expect can provide us useful information.
Give an example of something that is not testable
varies
Data collection and analysis
Nazeni wants to see how long it takes for an orange tree to flower. Is this an experiment? Why or why not
No, because there is no variable that is being tested.
Which word in each statement tells us it is an opinion?
Walking and chewing gum is difficult to do at the same time.
You should not walk and chew gum at the same time.
Always walk and chew gum to enhance your multi-tasking skills.
difficult, should (not), always
A)17min 39sec
B) 22min 4sec
C) 18min 9sec
D) 18min 33sec
Put in order from fastest to slowest.
In order for something to be testable, it needs a __________ in the ___________ that the scientist is intentionally controlling.
change; experiment
The practice of science is always changing. It needs fresh new thoughts and outside the box thinking. We cannot do science the same way all the time. These are reasons that explain WHAT in regards to doing the scientific method?
Scientific investigations do not always follow the same scientific method.
True or False:
A conclusion must match the hypothesis.
All investigations need a chart or graph.
Your procedures must be clear so that they can be repeated by others.
In the science fair, you have to follow all the steps of the scientific method.
In other observations, you don't have to follow all the steps of the scientific method.
false, false, true, true, true
We conducted an experiment on the growth of tomato plants with the variable being the types of water. We charted data each week for 5 weeks. Which one is an observation and WHY?
1) Different soil would have made them grow better.
2) Tap Water group will continue higher growth than Filtered Water group.
3) Tap Water group was the first to sprout at week 2.
4) This experiment would have worked better if all groups received equal sunlight.
3) It is the only one that is measurable/observable
Kevin, Amaziah, and Eliane all rolled 3 cars down a ramp but Eliane's results were different from Kevin and Amaziah's. We realized that Eliane was adding human error to her experiment. What was most likely that human error?
She applied more force than the other two
All testable experiments need a _____________ that is being controlled, and the data needs to be ______________.
variable, measurable
If 7 lab groups got the same results, but 3 did not, what should we do with those results that were not the same?
We should question their data.
To confirm our __________, we as scientists need to __________ our experiments.
results; repeat
DAILY DOUBLE! Jaylah's times on 3 trials of the same race were 42, 38, and 34 seconds. She was faster by 4 seconds each time.
Jaylah's 4th trial will be 30 seconds.
Is this statement an opinion or observation and why?
Opinion, the 4th trial hasn't happened yet ("will be")
Kevin, Amaziah, and Eliane were testing which different surface was best for keeping an egg from breaking, dropping them 2 feet, then 4, then 6 feet high. Why is it important that they all drop them the same way and not throw them down?
Because they are testing the different surfaces, not the amount of force being applied.
I put sugar and salt over an ice cube and timed how long it would be faster or slower than normal. This is an (experiment/observation) because it has a _________. The _________ ________ would be an ice cube without salt or sugar. (All/Not all) experiments need this group.
experiment
variable
control group
Not all