Which of the following is a reason that scientists use controlled ...

[fbq8i]

Which of the following is a reason that scientists use controlled conditions?
 
  A) It simplifies data analysis
  B) It is a requirement for an experiment to be published
  C) It promotes valid and reliable results
  D) It is essential to every experimental design

Question 2

In the case study which describes Galileo's experiment of dropping two objects of different weights from the Leaning Tower of Pisa, a variety of control problems were found to exist.
 
  How could Galileo have controlled for some of these problems, as mentioned in your
  text?
  A) He could have dropped one object, and had another person drop the other
  object at the same time.
  B) He could have constructed a box, which would allow both objects to drop
  at the same time.
  C) He could have controlled for wind resistance, dropping both objects at the
  same time.
  D) He could have chosen a better location and dropped both objects from it.

[spencer.martell]

Answer to Question 1

C

Answer to Question 2

B