Find the number of all possible samples from a population containing 18 items from which 6 items are selected at random without replacement.
A. 18564
B. 15864
C. 20264
D. 21564
Answer:A
Find the number of all possible samples from a population containing 18 items from which 6 items are selected at random without replacement.
A. 18564 B. 15864 C. 20264 D. 21564
Explanation: The number of ways of selecting n samples from a population containing n items is NCn. The population is N = 18 and sample size is n = 6. Therefore the number of possible samples are 18C6 = 18564.