Question

1. caelyn wanted to find out what shampoo made her hair the shiniest. everyday she washed her hair with different shampoos and then rated how shiny her hair was, on a scale from 1 - 10. she used pantene, herbal essences, loreal, and just water.

\ta. independent variable (iv):
\tb. dependent variable (dv):
\tc. control:
\td. constants:

1. fredrick wanted to find out what soil works best for growing roses. he grew them in potting soil, clay, sand, and soil he found outside his yard. after one week, he measured their height and how many leaves they had.

\ta. independent variable (iv):
\tb. dependent variable (dv):
\tc. control:
\td. constants:

1. anna wanted to see what battery lasted the longest. she put each battery into a clock and recorded the time that the clock stopped. she used duracell, energizer, kroger brand, and everready.

\ta. independent variable (iv):
\tb. dependent variable (dv):
\tc. control:
\td. constants:

1. darius wanted to test how the mass of a paper airplane affected the distance it would fly. paper clips were added before each test flight. as each paper clip was added, the plane was tested to determine how far it would fly.

\ta. independent variable (iv):
\tb. dependent variable (dv):
\tc. control:
\td. constants:

Explanation:

7.

• The independent variable is what is changed. Here, it's the type of shampoo.
• The dependent variable is what is measured, which is hair shininess rating.
• The control is using just water as a baseline.
• Constants are factors that stay the same like the person (Caelyn), time of washing etc.

• The independent variable is the type of soil as it's being varied.
• The dependent variable is the growth - height and number of leaves of roses.
• There is no clear control mentioned but could be considered as a standard soil type if any.
• Constants are factors like the type of rose, sunlight, watering amount etc.

• The independent variable is the brand of battery being tested.
• The dependent variable is the time the clock runs before stopping.
• There is no control stated but could be a non - battery or a known standard battery.
• Constants are the clock, environmental conditions etc.

Answer:

a. Type of shampoo
b. Hair shininess rating
c. Just water
d. Person (Caelyn), time of washing, etc.

8.