Even in a well designed experiment, there will always be ...

[amal]

Even in a well designed experiment, there will always be confounding variables that we have neglected to measure. How can we reduce the chances that an observed association is due to those confounding variables? Name two ways.

Question 2

What is the only legitimate way to try to establish a causal connection statistically between two measurement variables?

[31809pancho]

Answer to Question 1

1) USE A LARGE SAMPLE OF SUBJECTS; 2) RANDOMLY ASSIGN SUBJECTS TO TREATMENTS.

Answer to Question 2

THROUGH THE USE OF RANDOMIZED EXPERIMENTS.

[amal]

Excellent

[komodo7]

Gracias!