Vocabulary
The one thing you change in an experiment
independent variable
how many independent variables can be measured in a reliable experiment?
one
An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid; water, apple juice, or milk. Each plant has the same amount of soil, same amount of sunlight, and the same amount of liquid. In this investigation, what is the independent variable?
type of liquid
Mx. S set up an experiment to see how the mass of a ball affects the distance it rolls off a ramp. Identify the dependent variable.
distance traveled by the ball
You throw a ball and notice it is squishy. You determine it needs more air. Qualitative or Quantitative?
Qualitative
variable that you measure in an experiment
dependent variable
When experimenting with the growth of a plant, a scientist uses three (of the same type of) plants, two different fertilizers, equal light, and equal water. What type of variable is the fertilizer?
Independent
What part of the hypothesis is the IV? Is it the "If" or the "then"?
If and it comes first
Mr. S normally uses praise as a reward to train his dog. He wants to know the best way to train his dog, so he sets up an experiment to find out if there is a better way to get his dog to respond to commands. What is his dependent variable?
amount of time dog responds to commands
Maria wants to know if birds prefer to eat in one place over another. She makes three feeders out of 2-liter bottles and paints all of them red. She fills each of the feeders with the same amount of mixed birdseed, and plans to keep the feeders out for 10 days before measuring how much seed is eaten from each feeder. She puts each of the feeders in her back yard: one feeder in a large dead tree, another feeder she sits on the dog house, and the last she sits in a small bushy tree.What is 1 example of quantitative data? List something no one else does FROM THE TEXT and earn an extra $100.
2-liter soda bottle
10 days
amt of seed eaten
The control group or level of the experiment is the normal or starting group. Why do we include it?
It is used as a comparison.
Sabrina wants to test which brand of popcorn pops the most kernels. She picked a Giant Eagle brand, Orville Redenbacher, and PopSecret. All three bags started with the same number of kernels. She popped each for 3 minutes in the same microwave, and then counted the number of kernels left over. What is her independent variable?
brand of popcorn
For an extra $200, what would be hard to figure out about this IV? Use a science vocabulary word.
Angelina performed an investigation to find out how the concentration of salt water affected the hatching of brine shrimp. What is the INDEPENDENT Variable?
Salt water concentration
The dependent variable always determines if it is a line graph or a bar graph? True or False and explain why.
False- the IV does that. The DV is always a number so it won't change the type of graph.
What can you use the letter N to remember about quaNtitative data?
numbers
How can you use the "D" in Dependent Variable to remember what it is?
"D"ata also starts with a D. The dependent variable is the data you measure at the end.
Mx. B's classes were testing to see which soil would support plant growth. They used the same seeds, same pots, gave the same amount of water to each, and put them all in the same location. What could be the Dependent variable for this experiment?
it must be some way to MEASURE plant growth, so it could be #leaves, height grown, etc.
Why must you have only 1 IV to make your experiment reliable?
So you know what causes the change.
Daily Double: How much do you have and how much will you bet?
Which axis always has the dependent variable on a graph?
Y- axis
Which axis on a graph can have either a qualitative or a quantitative topic?
1) X-axis
2) Y-axis
3) Either
x-axis because it is the IV which can be either. The DV MUST be quantitative.
Define Procedure. You must include one really important word for credit.
a set of instructions so someone else can REPEAT your experiment and get similar results.
Mx. B's classes were testing to see which soil would support plant growth. They used the same seeds, same pots, gave the same amount of water to each, and put them all in the same location. What is at least 1 constant variable? List one that no one else does and earn an extra $100. ONLY LIST ONE
same seeds, same pots, same amount of water, same location
David performed an investigation to find out how temperature affects crystal growth. Give her independent variable and explain how it could be a LINE graph.
Temperature- and it would have to be numbers such as degrees and not cold, room, and hot.
What must always be true about the DEPENDENT variable to make the lab RELIABLE? You must include a science vocabulary word to earn credit.
It must be quantitative.
How can you use the letters LI in qualitative or quality to remember what quality means?
LI can be like List descriptions, but many answers can work as long as they connect to descriptions and not numbers.