I If the Null Hypothesis States That There Is No

i. If the null hypothesis states that there is no difference between the mean income of males and the
Mean income of females, then the test is one-tailed.
ii. If we are testing for the difference between two population means, it is assumed that the sample
Observations from one population are independent of the sample observations from the other
Population.
iii. When sample sizes are less than 30, a test for the differences between two population means
Has n - 1 degrees of freedom.

A) (i) , (ii) , and (iii) are all correct statements.
B) (i) and (ii) are correct statements but not (iii) .
C) (i) and (iii) are correct statements but not (ii) .
D) (ii) and (iii) are correct statements but not (i) .
E) (ii) is a correct statement but not (i) and (iii) .