Cohen's d expresses the magnitude of the difference between ...

[Sufayan.ah]

Cohen's d expresses the magnitude of the difference between groups in _____ units.
 
  a. standard deviation c. standard score
  b. raw score d. standard error

Question 2

Why is it important to know the size of the effect in an experiment? It is important because _____.
 
  a. it is possible to achieve statistical significance with very small differences when n is big
  b. statistically significant differences do not necessarily have practical significance
  c. both a and b
  d. none of these

[pikon]

Answer to Question 1

A
d is a measure of the number of standard deviation units that separate the group means.

Answer to Question 2

C
The larger the n, the smaller the difference between means that is required in order to be statistically significant.

[Sufayan.ah]

Thank you

[pikon]

No problem