Question

Which of the following statements is true?

Observations are often used to form questions about the world.
The dependent variable is changed by the experimenter.
The best hypotheses are written as answers to a question.
A hypothesis is created at the end of an experiment.

Answer 1

b

Explanation: its b

Answer 2

The answer is B.

Step-by-step explanation:

They are in control of the experiment, they can change it the variables to better help the experiment.