Which combination of factors will produce the largest value for the standard error?

Which combination of factors will produce the largest value for the standard error?
 
  a. A large sample and a large standard deviation
  b. A small sample and a large standard deviation
  c. A large sample and a small standard deviation
  d. A small sample and a small standard deviation

Question 2

What happens to the standard error of Mas sample size increases?
 
  a. It increases.
  b. It decreases.
  c. It stays constant.
  d. The standard error does not change in a predictable manner when sample size increases.

Question 3

What happens to the expected value of Mas sample size increases?
 
  a. It increases.
  b. It decreases.
  c. It stays constant.
  d. The expected value does not change in a predictable manner when sample size increases.