Variables

Katiana wanted to figure out what type of liquid worked best for growing beans. She watered one with coca-cola, one with lemonade, and one with just water. After one week, she measured how high they had grown. What is the independent variable?

• Bean growth

• Type of liquid

• Plant watered with water

• Type of plant

Trevor wanted to find out what fertilizer worked best for growing marigolds. He put Miracle Grow on one, Scotts fertilizer on another, and no fertilizer on the third marigold. What is the control?

• Marigold with no fertilizer

• Type of fertilizer

• Plant growth

• Amount of water

Taylor wanted to see if eating apples would help her do better with her classwork. The first day, she didn't eat any apples. On day 2, she ate one apple. On day 3, she ate 2 apples. And finally, on day 4, she ate 3 apples. Each day she recorded the grades that she received on her science classwork. What is the dependent variable in this experiment?

• Number of days

• Number of apples

• The day she did not eat any apples

• The grades received on her science classwork

CJ wanted to see if listening to music would allow the basketball players to make more baskets. On day one, he didn't play any music and counted how many how many baskets they could make in 10 minutes. On day two, he played rap music and counted the baskets. On day three, he played classical music and counted the baskets. What was the independent variable?

• Type of music

• Number of baskets made

• Number of days

• Baskets made with classical music

Michael wanted to see what kitchen cleaner worked best for cleaning her counters. He used Lysol, Clorox, Pine-Sol, and water. For each cleaner, he used 5 milliliters of grape juice on the counter, sprayed the cleaner, and wiped it with one paper towel. Which of the following would be a constant?

• Lysol

• Cleaning products

• 5 milliliters of grape juice

• Cleanest countertop recorded

Alex wanted to find out what toothpaste made teeth the cleanest. Every day he brushed his teeth with a different product and then took a plaque test to see how much plaque was left. He tested Crest, Colgate, Close-Up and water. What is the dependent variable?

• Type of toothpaste

• Amount of plaque left after brushing

• Amount of times the teeth were brushed

• Amount of toothpaste used

Caelyn wanted to find out what shampoo made her hair the shiniest. Every day she washed her hair with different shampoos and then rated how shiny her hair was on a scale of 1-10. She used Pantene, Herbal Essences, L'Oreal, and just water. What would be a constant in this experiment?

• Amount of each shampoo used

• Shininess of her hair

• Scale of 1-10

• Type of shampoo used

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. Which of the following is the control group?

• Rose grown in soil from his yard

• Type of soil

• Height of the roses

• Number of leaves on the roses

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 batteries, and EverReady batteries. Which of the following is the independent variable?

• Time the clock stopped

• Type of battery

• Type of clock

• The current time on the clock

Three sunflower plants are watered with salt water. Each plant receives a different concentration of salt solution. A fourth plant receives pure water. After a two week period, the height is measured. Which variable would be placed on the x-axis?

• Four sunflower plants

• Concentration of salt solution

• Heigh of each sunflower

• Two week period