Qualitative v Quantitative
The leaves are large and green.
qualitative
What is an inference?
Using your observations to make a guess about an object or an outcome.
When Mr. Han used more force to throw the ball, the ball traveled further across the room. What is the independent variable? What is the dependent variable?
IV- amount of force DV- distance ball move
If I add more milk, the tea will get a lighter color. Which is the dependent variable?
The tea color.
The tree measures 5 feet 4 inches tall.
quantitative
This surface feels slippery. Is this statement an observation or an inference? Why?
Observation, you are using your sense of touch to get information.
When Mr. Han used more force to throw the ball, the ball traveled further across the room. List one control variable for that situation.
style of throw, type of ball, location, point of release
If I run, I will lose weight. Which is the independent variable?
Running
Which type of observation uses your 5 senses to collect information?
qualitative
What is a dependent variable?
The dependent variable is the variable that you measure or observe. (data)
This footprint was made by a dinosaur. Is this statement an observation or an inference?
Inference, you are guessing its a dinosaur that made the footprint.
When John increases the amount of time to study, usually his test scores increase as well. What is the independent variable? What is the dependent variable?
IV- amount of study time DV- test score
It will get colder if the wind blows faster. What is the independent variable?
The wind speed.
What's the difference between quantitative and qualitative observation? Give example of both.
QNT- observation using numbers, QL- observation without using numbers.
You should have at least how many controlled variables?
3
Mr. Han came into class looking all wet. The students thought that he got caught in the rain and ran instead of walked to school. What part of this statement is an observation and what part is an inference? Explain.
Observation- "Mr. Han came into class looking all wet." Inference- "The students thought that he got caught in the rain and ran instead of walked to school."
Mr. Han thinks that the "Quantum" Duracell battery has more energy than the regular Duracell battery. He wants to test out his hypothesis by doing the following experiment. He will use one new "Quantum" battery to power a flashlight and a old regular battery to power a clock. He leaves the flashlight and clock on until it turns itself off. He will record the time. Is this experiment considered a fair experiment? Explain.
It is not a fair experiment because there is more than one independent variable.
Cactuses (cacti) were studied to determine if the amount of humidity affects the growth of the plants. Which of these was the independent variable in the study?
The amount of humidity
There are 954 students at SMS. Quantitative or qualitative observation? Why?
Quantitative observation because describe something using numbers to quantify.
How many independent variables can you have in a fair experiment?
1
Observation or Inference? The boy is crying.
Observation
Marquis wants to see how light affects a plants growth. He places a tomato plant in his closet, a tomato plant in the kitchen, and a tomato plant on his porch. He gives them the same amount of water for 4 weeks. Is this a fair test?
Yes, there is only one independent variable (the sun) and there are at least 3 controlled variables (type of plant, same amount of water, same amount of time).
Plants were grown in different environments to see if temperature affects the number of new leaves per week. Which variable is the dependent variable?
Number of new leaves per week