A study finds that children who spend more hours in TV viewing score lower class grades in school. This correlation is an example of:

Arranging your target population in an ordered scheme from which participants or items are chosen at regular intervals is an example of:

When a researcher doesn't know much about a certain problem and wants to gain more information about it, which research design will he use?

The _____ is a useful tool for assessing whether the means of two groups of variable are statistically different from each other.

There are two ways to present categorical data. One is by way of graphs, the other is by way of .... .

When a person conducts analysis using data he or she has not collected, the source of such data is called:

What is the first moment of distribution?

Suppose c is a constant number. Calculate var(c).

The probability of a discrete value in a continuous distribution is equal to __?

Suppose E and F are mutually exclusive events in a sample space S with probabilities .4 and .3 respectively. What is the probability of their union?

What is the median of the following 5 numbers? 10, 2, 4, 3, 1