WHICH AMONG THE FOLLOWING STATEMENTS IS/ARE TRUE REGARDING T-TEST

26.

Which among the following statements is/are true regarding t-test ?

(a)

an independent sample t-test compares the means of two groups.

(b)

a paired sample t-test compares means from the same group at different times.

(c)

the t-score is a ratio between the difference among two groups and the association

within the group.

(d)

one sample t-test tests the mean of a single group against a known mean.

Code :

(1)

(a) and (b) only

(2)

(c) and (d) only

(3)

(a), (b) and (d) only

(4)

(a), (b), (c) and (d)