Experimental design- variables and operational definitions

What is the INDEPENDENT variable in this experiment?

"I believe given equal amount of heat, the metal copper conducts heat faster than aluminum, steel, or silver."

• size of metal

• types of metal

• time it takes to heat up

• shape of the metal

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4

Diego wants to know if drinking milk each morning affects how tall Dora grows. Which is the independent variable?

• Drinking milk.

• Diego's growth.

• Dora's growth.

• Chocolate or plain milk.

• TV channel the show is on

Tags

NGSS.MS-LS1-5

The one variable you change & test in an experiment to see if it has an effect on the result is called a/an:

• Controlled variables (constants)

• Dependent variable (responding variable)

• Independent variable (manipulated variable)

• Control group

• Crazy guess.

The variables that are kept the same for ALL trials in an experiment are called:

• Controlled variables (constants)

• Dependent variable (responding variable)

• Independent variable (manipulated variable)

• Game controllers

Tags

NGSS.MS-PS2-2

Two groups of plants (Group 1 and Group 2) were planted in identical pots, with identical soils, in identical lighting and temperature environments, receiving identical amounts of water and fertilizer. Every day, Group 2 plants also received small, measured amounts of acid mixed with the water that they received.

What is the independent variable?

• The temperature

• The acid

• The fertilizer

• The soil

• The type of plant

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

Maya designed an experiment to answer the following question: How does the amount of water given to a lima

bean seed affect how tall it grows?

Multiple answer!!!! Which things does Maya need to keep the same in her experiment?

• the amount of water each plant gets

• the amount of soil

• the type of plant

• the amount of sunlight each plant gets

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

This type of definition specifies clear, specific, reproducible procedures able to be used by others to understand the tests or experiment.

• A. Operational definition

• B. Parenthetical definition              

• C. Expanded definition

• D. Technical definition

Identify which of these is a proper operational definition for plants grow faster!

• A. the biggest plant when it dies

• B. most berries on the branches

• C. the greatest height at each weekly check

• D. the most intense green leaves compared to others

Which of the following statements below is an example of an operational definition for "employee satisfaction"?

• A. Employee satisfaction is the number of days per month that the employee shows up to work on time.

• B. Employees use the bathroom 3 or more times a day.

• C. Employees discuss popular culture movies and memes instead of working.

• D. Employee reference list, lists all the sources used in the research.

Maya designed an experiment to answer the following question: How does the amount of water given to a lima

bean seed affect how tall it grows?

In this experiment, what variable should Maya CHANGE?

• the amount of water

• the kind of plant

• the type of soil

• the amount of sunlight it gets

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1