1:
In many business situations, we rely on random sampling. Which ONE of the following is NOT a reason we do this?

A. We often do not know what random variable X we are interested in.
B. We often do not know the c.d.f. distribution of a random variable X that we are interested in.
C. We often do not know the p.m.f. or p.d.f. distribution of a random variable X that we are interested in.
D. We often do not know the expected value of a random variable X that we are interested in.

2:
A random sample of size n is defined as:

A. The set of all possible values of X.
B. The set of n independent observations of X.
C. The set of n random values.
D. The set of all values of fX(x).