Question

an experimenter wants to determine how fertilizer effects algae growth. what would be the dependent variable?
○ algae growth
○ fertilizer amount
○ the water
○ the type of algae used in all experimental trials
question 4
1 pts
to make an experiment more valid a scientist should
○ tell the public via twitter as soon as they have results
○ make sure to test more than one variable at a time
○ do multiple trials to collect a lot of dataa
○ hide their data and change their hypothesis if the data doesnt agree with it

Explanation:

First Question (Dependent Variable in Experiment)

In an experiment, the dependent variable is what is being measured or observed, and it depends on the independent variable. Here, the experimenter is testing how fertilizer (independent variable, manipulated) affects algae growth. So algae growth is the outcome being measured, hence the dependent variable. Fertilizer amount is the independent variable (manipulated), water and algae type are likely controlled variables.

To increase experiment validity, doing multiple trials to collect more data reduces random error and increases reliability. Sharing results on Twitter doesn't affect validity. Testing multiple variables at once (confounding variables) reduces validity. Hiding data and changing hypothesis is unethical and invalidates results.

Answer:

A. Algae growth

Question 4 (Increasing Experiment Validity)