Objective type problems for random variables.

1. For a continuous random variable x the probability density function f(x) represents

1) the probability at a given value of x
2) the area under the curve at x
3) the area under the curve to the right of x
4) the height of function at x

2. The unchanging probability distribution is used with

1) A continuous random variable
2) A discrete random variable
3) A normally distributed random variable
4) Any random variable, as long as it is not nominal

3. In a standard normal distribution the range of values of z is form

1) minus infinity to infinity
2) -1 to 1
3) 0 to 1
4) -3.09 to 3.09

4. The function that describes the probability distribution of a continuous random variable is a

1) Normal function
2) Uniform function
3) Either normal of uniform depending on the situation
4) Probability density function

5. describe the exponential probability distribution is used with

1) Discrete random variable
2) A continuous random variable
3) Any probability distribution with an exponential term
4) An approximation of the binomial probability distribution