The standard error of the mean decreases in direct proportion ...

[Garrulous]

The standard error of the mean decreases in direct proportion with the
 
  a. the number of subjects squared
  b. square root of the number of subjects divided by the standard deviation
  c. the number of subjects
  d. anticipated variability of the data

Question 2

The number of subjects to be used in an experiment should depend mainly on
 
  a. the size of the effect
  b. the anticipated variability of the data
  c. the number available
  d. both a and b

[katkat_flores]

Answer to Question 1

c

Answer to Question 2

d

[Garrulous]

Wow, this really help

[laurnthompson]

Thanks for the timely response, appreciate it