Experimental Design Practice

A student is testing to see if using salt water on tomato plants will have an effect on how many tomatoes they produce.

Groups:

(a) Independent Variable

,

(b) Dependent Variable

,

(c) Constants

• type of tomato plants

• Number of tomatoes produced

• amount of water

• Salt Water

• type of soil

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

A student is testing to see if keeping bread in a sealed plastic bag helps it last longer (no mold growth) compared to when the bread is open to the air.

Groups:

(a) Independent Variable

,

(b) Dependent Variable

,

(c) Constants

• sealed plastic bag

• amount of mold growth

• type of bread

• age of bread

• temperature of the room

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

A student athlete is testing to see if drinking a sports drink before a soccer game helps her score more goals.

Groups:

(a) Independent Variable

,

(b) Dependent Variable

,

(c) Constants

• number of goals scored

• same position on field

• weather conditions

• drinking a sports drink before a game

• amount of rest time before the game

A scientist/mom is testing to see if the amount of screen time her child receives affects their ability to focus later on in the day.

Groups:

(a) Independent Variable

,

(b) Dependent Variable

,

(c) Constants

• amount of screen time

• same child

• time of day

• type of activity to focus on

• ability to focus

A group of doctors are testing to see if the flu vaccine for this year is effective in preventing the flu.

Groups:

(a) Independent Variable

,

(b) Dependent Variable

,

(c) Constants

• time of year

• number of vaccinated people who got the flu

• health of participants

• getting the flu vaccine

• age of participants