Question

8. Jake conducted an experiment with four bean plants.

They were placed next to one another on a sunny
windowsill. He gave each plant equal amounts of a
different type of water. The plants were given tap water.
distilled water, flavored water, or carbonated water. He
made the following observations after three weeks.

Based on his results. Jake concluded that tap water is not
good for plants. How can Jake change his experimental
design to improve the validity of his results?
A. carry out multiple trials, and increase the number of
plants that are given each type of water
B. establish a control group that includes different types of
plants
C. establish another dependent variable to generate more
data
D. carry out multiple trials that include fewer plants, and
increase the types of water given to the plants

Answer 1

To improve the validity of his results, Jake should carry out multiple trials, increase the number of plants, and include a control group in his experimental design.

Step-by-step explanation:

In order to improve the validity of his results, Jake can change his experimental design in the following ways:

1. Carry out multiple trials: by repeating the experiment with different sets of plants, Jake can ensure that his results are consistent and not just due to chance.
2. Increase the number of plants: using a larger sample size will make the results more representative and increase the statistical power of the study.
3. Include a control group: by having a group of plants that receive no water, Jake can compare the growth of the plants in different types of water with those that receive no water at all. This will help him determine the true effect of each type of water.