Quiz 1- Experimental Design

An independent variable is the variable in an experiment that is-

• left unchanged

• manipulated by the scientist

• measured as response to change

• kept constant

Tags

NGSS.MS-PS2-2

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

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-4

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

Tags

NGSS.MS-PS3-4

Which of the following variables is the independent variable?

• type of water

• Number of tadpoles

• pH of water

• person counting tadpoles

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

NGSS.MS-LS2-4

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

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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

Tags

NGSS.MS-ETS1-3

NGSS.MS-PS2-2

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