For a sample less than 30 we can use t-distribution only if
A. The population is normally, or approximately normally, distributed.
B. s is unknown
C. s is known
D. Both A & B
Answer:D
For a sample less than 30 we can use t-distribution only if
A. The population is normally, or approximately normally, distributed. B. s is unknown C. s is known D. Both A & B