แผ่นงานQuiz 1- Experimental Design
คำถามทั้งหมด: 14
An independent variable is the variable in an experiment that is-
left unchanged
manipulated by the scientist
measured as response to change
kept constant
Andy wants to know if adding real plants to his fish tank will help balance out the pH level of the water. He takes a sample from his current fish tank and checks the pH. He then adds an algae plant to his tank and takes another sample before checking the pH again. He did not change the type of fish that are currently residing in the tank and did not add any new decorations or chemicals. Which is the dependent variable?
the pH
the live plant
the type of fish in the tank
the other chemicals in the tank
Barbie wants to get the best gas mileage on her trip to the human world. She takes trip A with regular gas in her car and records the distance she was able to drive on 1 tank of gas. She takes a second trip, going the same exact route, and during trip B uses diesel gas before recording the distance she is able to travel. Which of these is the control group?
Trip B
Diesel gas
using the same car
Trip A
Which of the following variables is the independent variable?
type of water
Number of tadpoles
pH of water
person counting tadpoles
Which conclusion is best supported by the data in the table?
Temperature and solubility show no direct relationship
As temperature increases solubility also increases
As temperature increases solubility remains unchanged
As temperature increases, solubility decreases
Wendy heard a claim that delta airlines builds their planes differently than southwest which is why they can fly to the same destination faster. Identify the constant in this hypothesis.
southwest airlines
delta airlines
the same destination
the speed of flight
Dory wants to know if adding caffeine to er diet will improve her memory. She plays a memory matching game without having a cup of coffee and then plays the game again after having a cup of coffee. What is the purpose of playing the game without Dory having a cup of coffee?
to have a control group
to have an experimental group
to be the dependent variable
to be constant
Which hypothesis could be supported by the data gathered?
Soaking eggs in vinegar causes them to weigh less over time.
The composition of the egg shell causes a weight difference
Corn syrup weighs more than vinegar and water combined
Water is a great control group
A paper airplane with 17 added paperclips will fly further than a paper airplane that is folded of the same material but without paper clips. Which data should be collected from this experiment?
the paper material of the plane
distance the planes flew
the number of paperclips
who threw the plane
Based on the data table provided, what question was the researcher trying to solve?
The amount of time spent studying can affect the sleep schedule of the student.
Each student should spend however much time they want studying
If students spend more time studying then their test scores will increase
Test are independent of the hours spend studying
Which of these is the independent variable?
hens with chicks
hens without chicks
total number of hens
the month
Which of these are the dependent variable?
Time of day
temperature
the 1st f September
2 pm
Sandra wonders if adding salt to water will affect how long it takes the water to freeze. Al thinks that salt water will freeze more quickly than fresh water. She decides to check her hypothesis by conducting an experiment. Sandra takes two ice trays and fills one with distilled water and the other with distilled water that has two tablespoons of salt added. She makes sure she puts exactly the same amount of water in each ice tray. Sandra takes the trays and puts them side by side in the freezer. She checks the ice trays every 10 minutes to see if the water in each tray has begun to freeze. Sandra finds that after 20 minutes the water in the ice tray without the salt has started to form ice, while the ice tray with the salt water is still completely liquid. Identify the control group-
how long it takes the water to freeze
salted water
unsalted water
the trays she used
How confident are you about identifying variables and analyzing graphs?
Very
A little
Not at all
แป้นคำตอบQuiz 1- Experimental Design
คำถามทั้งหมด: 14
manipulated by the scientist
the pH
Trip A
pH of water
As temperature increases, solubility decreases
the same destination
to have a control group
Soaking eggs in vinegar causes them to weigh less over time.
distance the planes flew
If students spend more time studying then their test scores will increase
the month
temperature
unsalted water