IV / DV
A scientist wants to know if the amount of light affects how quickly a zombie can find a hidden object.
What is the dependent variable in this experiment?
Amount of time it takes to find the object
What is the first step in the scientific method?
Make an observation
An educated guess based on an observation
Inference
Which statement is an observation?
1. The dog is hungry
2. The dog ate the food
3. There are crumbs on the floor
4. The dog is waiting for more food?
3. There are crumbs on the floor
No matter how long I have travelled, if I end up at my starting point what is my displacement?
0
True or False-
Dependent variable is the thing you purposefully change in an experiment?
FALSE
What is the format we use to write a hypothesis?
IF... THEN... BECAUSE...
What is- an organized procedure to study something under controlled conditions
Experiment
You walk into a room and see a cat sitting next to a broken vase.
Which is an inference you can make about this statement?
A. The vase is on the floor
B. The cat knocked over the vase
C. The vase is broken
B. The cat knocked over the vase
A dog runs 10 meters north. What is his distance and displacement?
Distance: 10 m
Displacement: 10 m north
The passage below describes an experiment. Read the passage and think about the variables that are described.
Walter liked to hike, but he was often bothered by mosquito bites. He read that rubbing lavender flowers on your skin can repel mosquitoes. Walter wanted to find out if lavender flowers work better as a mosquito repellent than store-bought bug spray. So, he sprayed bug spray on one of his arms and rubbed lavender flowers on his other arm. Then, he went for a hike.
When he got home, he counted the number of new mosquito bites on each arm. Walter repeated this test each afternoon for one week
What is the independent variable?
Type of repelent
Which order is the correct format for a hypothesis?
A. If IV then DV because...
B. If DV then IV because...
A
Information gathered from direct observations, measurement, and testing
Empirical Evidence
What are the 2 types of Observations?
Qualitative and Quantitative
A person walks 15 meters east and then 5 meters west.
What is their distance and displacement?
Distance: 20 m
Displacement: 10 m east
How many variables can you change in an experiment to make it far?
Only 1
What does it mean if my hypothesis is supported?
My experiment results were in favor with what I predicted
True or False:
Scientific laws describe and theories explain
True
Is this observation Qualitative or Quantitative?
It is 90 degrees outside
Quantitative
What is the formula to find distance
Speed x Time
A student wonders if eating pizza before running would affect his running speed. They have students eat 0,2, or 4 slices of pizza before running 100 meters.
What are my different variables?
IV: Amount of pizza eaten
DV: Running time/speed
Control: Distance of the race
True or False-
I only need to do 1 trial in an experiment
False
What is the definition of an independent variable
The variable that the experimenter is controlling
Read this statement: The plant is 42 cm tall, so it is probably unhealthy because it has not been watered enough.
Which part of this statement is an observation and an inference?
Quantitative observation- 42 cm tall
Inference- It is unhealthy
You are sitting in your room and hear someone yell NACHOS, you run 8 m north to the kitchen to get the nachos, and 8 meters south back to your room.
How far did you travel? What was your displacement?
Distance: 16 m
Displacement: 0 m