If other factors are held constant, what is the effect of increasing the sample size?

If other factors are held constant, what is the effect of increasing the sample size?
 
  A) It will increase the estimated standard error and increase the likelihood of rejecting H0.
  B) It will increase the estimated standard error and decrease the likelihood of rejecting H0.
  C) It will decrease the estimated standard error and increase the likelihood of rejecting H0.
  D) It will decrease the estimated standard error and decrease the likelihood of rejecting H0.

Question 2

A sample of 100 people is classified by gender (male/female) and by whether or not they are registered voters. The sample consists of 80 females and 20 males, and has a total of 60 registered voters. If these data were used for a chi-square test for independence, what is the expected frequency for males who are registered voters?
 
  A) 12
  B) 20
  C) 40
  D) 60

Question 3

If other factors are held constant, which set of sample characteristics is most likely to produce a significant t statistic?
 
  A) n = 25 with s2 = 100
  B) n = 25 with s2 = 400
  C) n = 100 with s2 = 100
  D) n = 100 with s2 = 400