Question

for each experiment, write down the independent variable (iv), dependent variable (dv), and control. for some, identify the constants as well.

1. 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.

a. independent variable (iv):
b. dependent variable (dv):
c. control:

1. trevor wanted to find out what fertilizer worked best for growing marigolds. he put miracle grow on one, scotts fertilizer on one, and no fertilizer on another.

a. independent variable (iv):
b. dependent variable (dv):
c. control:

1. taylor wanted to see if eating apples would help her do better on her classwork. the first day, she didnt eat any apples. on day 2, she ate one apple; on day 3, she ate 2 apples; and on day 4, she ate 3 apples. each day, she recorded the grades she got on her science work.

a. independent variable (iv):
b. dependent variable (dv):
c. control:

1. cj wanted to see if listening to music would make the basketball players make more baskets. on day one, he didnt play any music and counted how many baskets they could make in 10 minutes. on day 2, he played rap music and counted the baskets, and on day 3, he played classical music and counted the baskets.

a. independent variable (iv):
b. dependent variable (dv):
c. control:

1. michael wanted to see what kitchen cleaner worked best for cleaning her counters. he used lysol, clorox, pine - sol, and just water. for each cleaner, he put 5 milliliters of grape juice on the counter, sprayed the cleaner, and wiped it with one paper towel.

a. independent variable (iv):
b. dependent variable (dv):
c. control:
d. constants:

Explanation:

1.

• a. The type of liquid (coca - cola, lemonade, water) is what Katiana changes, so it's the independent variable.
• b. The height the beans grow is what is affected by the liquid type, so it's the dependent variable.
• c. There is no control group in a strict sense here as all are experimental groups with different liquids, but if we consider a standard condition, we could say a plant with no liquid (not in this setup) would be a control.

2.

• a. The type of fertilizer (Miracle - Grow, Scotts, no fertilizer) is the independent variable as it's what Trevor changes.
• b. The growth of marigolds is what is affected by the fertilizer, so it's the dependent variable.
• c. The plant with no fertilizer is the control as it provides a baseline for comparison.

3.

• a. The number of apples eaten is the independent variable as it's what Taylor changes.
• b. The grades on science work are what is affected by the number of apples eaten, so it's the dependent variable.
• c. The first day when she didn't eat any apples is the control as it's the baseline condition.

4.

• a. The type of music (no music, rap music, classical music) is the independent variable as it's what CJ changes.
• b. The number of baskets made is what is affected by the music, so it's the dependent variable.
• c. The day when no music was played is the control as it provides a baseline for comparison.

5.

• a. The type of kitchen cleaner (Lysol, Clorox, Pine - Sol, water) is the independent variable as it's what Michael changes.
• b. The cleanliness of the counter (how well the grape juice is removed) is the dependent variable as it's affected by the cleaner.
• c. Using just water can be considered the control as it's a basic, non - chemical option for comparison.
• d. The amount of grape juice (5 milliliters), the use of one paper towel for each cleaner are constants.

Answer:

1.
a. Type of liquid
b. Height of beans
c. N/A (no strict control in setup)
2.
a. Type of fertilizer
b. Growth of marigolds
c. Plant with no fertilizer
3.
a. Number of apples eaten
b. Grades on science work
c. Day 1 (no apples eaten)
4.
a. Type of music
b. Number of baskets made
c. Day 1 (no music)
5.
a. Type of kitchen cleaner
b. Cleanliness of counter
c. Water
d. 5 milliliters of grape juice, one paper towel for each cleaner