Question

experimental design scenarios
ch scenario identify the: iv, dv, constants.

1. seeds were planted in each of 5 pots that contained 500 grams of \peat’s potting

the pots were given the following amounts of distilled water each day for 40 days.
, 50ml; pot 2, 100ml; pot 3, 150ml; pot 4, 200 ml; pot 5m, 250 ml. pot 3 received
recommended amount of water. the height of each plant was measured and the
or of the leaves was recorded at the end of the experiment.
:how much water them plant get
v:
constants (name at least 3):

1. an ecologist wants to investigate the effects of pollution on soybean plants. the

scientist grows five groups of plants and exposes them to various pollutants. the
ecologist observes the growth of all the plants for one month.
iv:
dv:
constants (name at least 3):

1. sir robert decided to test different potions on his pet fire - breathing dragon to find out

which one had an effect on the dragon’s fire. sir robert gave the dragon some of his
normal drink which was pepper juice. then he decided to test 3 other potions: milk, fish
fang potion, and bubble juice. with the pepper juice, the dragon blew fire as normal.
iv:
dv:
constants (name at least 3):

1. irving wanted to see if blue birds that inhabit his backyard show a color preference

when choosing a birdhouse in which to build their nests. he built 6 identical pine
houses. he then painted five of the houses a different color: red, yellow, green, blue,
and white. the sixth house was left unpainted.
iv:
dv:
constants (name at least 3):

Explanation:

Scenario 1 (Incomplete, but we'll analyze what's visible)

IV (Independent Variable):

The amount of distilled water given to each pot (since this is what's being changed: 50ml, 100ml, 150ml, 200ml, 250ml).

DV (Dependent Variable):

The height of each plant and the color of the leaves (since these are the outcomes being measured based on the amount of water).

Constants:

• Type of potting soil (500 grams of "Peat’s Potting" soil for each pot).
• Number of seeds planted in each pot (implied to be the same as it says "seeds were planted in each of 5 pots" without specifying different numbers).
• Duration of the experiment (40 days for all pots).

Scenario 2

IV (Independent Variable):

The type of pollution (or exposure to various pollutants) (since this is what the ecologist is changing by exposing different groups to various pollutants).

DV (Dependent Variable):

The growth of the soybean plants (since this is what's being observed as a result of the pollution exposure).

Constants:

• Type of plant (soybean plants for all groups).
• Duration of observation (one month for all plants).
• Growing conditions (implied to be the same for all five groups, like same soil, light, temperature, etc., unless stated otherwise).

Scenario 3

IV (Independent Variable):

The type of potion (pepper juice, milk, fish fang potion, bubble juice) (since this is what Sir Robert is changing to test its effect on the dragon's fire).

DV (Dependent Variable):

The dragon’s fire (specifically how the dragon blows fire, if it's normal or changed) (since this is the outcome being measured based on the potion given).

Constants:

• The dragon (same pet fire - breathing dragon is used for all tests).
• The way the potion is given (implied to be the same method of giving the potion).
• The environment where the dragon is tested (implied to be the same setting).

Scenario 4

IV (Independent Variable):

The color of the birdhouse (red, yellow, green, blue, white, and unpainted) (since this is what Irving is changing to test the birds' preference).

DV (Dependent Variable):

The birdhouse the blue birds choose to build their nests in (specifically which colored/unpainted house they pick) (since this is the outcome based on the color of the house).

Constants:

• Type of birdhouse (identical pine houses).
• Number of birdhouses (6 houses in total).
• Location (backyard where the blue birds inhabit, so same area for all houses).

Answer:

Scenario 1 (Incomplete, but we'll analyze what's visible)

IV (Independent Variable):

The amount of distilled water given to each pot (since this is what's being changed: 50ml, 100ml, 150ml, 200ml, 250ml).

DV (Dependent Variable):

The height of each plant and the color of the leaves (since these are the outcomes being measured based on the amount of water).

Constants:

• Type of potting soil (500 grams of "Peat’s Potting" soil for each pot).
• Number of seeds planted in each pot (implied to be the same as it says "seeds were planted in each of 5 pots" without specifying different numbers).
• Duration of the experiment (40 days for all pots).

Scenario 2

IV (Independent Variable):

The type of pollution (or exposure to various pollutants) (since this is what the ecologist is changing by exposing different groups to various pollutants).

DV (Dependent Variable):

The growth of the soybean plants (since this is what's being observed as a result of the pollution exposure).

Constants:

• Type of plant (soybean plants for all groups).
• Duration of observation (one month for all plants).
• Growing conditions (implied to be the same for all five groups, like same soil, light, temperature, etc., unless stated otherwise).

Scenario 3

IV (Independent Variable):

The type of potion (pepper juice, milk, fish fang potion, bubble juice) (since this is what Sir Robert is changing to test its effect on the dragon's fire).

DV (Dependent Variable):

The dragon’s fire (specifically how the dragon blows fire, if it's normal or changed) (since this is the outcome being measured based on the potion given).

Constants:

• The dragon (same pet fire - breathing dragon is used for all tests).
• The way the potion is given (implied to be the same method of giving the potion).
• The environment where the dragon is tested (implied to be the same setting).

Scenario 4

IV (Independent Variable):

The color of the birdhouse (red, yellow, green, blue, white, and unpainted) (since this is what Irving is changing to test the birds' preference).

DV (Dependent Variable):

The birdhouse the blue birds choose to build their nests in (specifically which colored/unpainted house they pick) (since this is the outcome based on the color of the house).

Constants:

• Type of birdhouse (identical pine houses).
• Number of birdhouses (6 houses in total).
• Location (backyard where the blue birds inhabit, so same area for all houses).