Importance of having probability samples

Question 6

Probability samples are those for which the members of the population:

can be found for survey purposes.

all have a chance of being included in the sample.

have an unknown chance of being included in the sample.

whose responses may be predetermined with some known probability.

Question 7

In sample size formulas, the symbol “e” stands for:

estimated parameter or desired confidence level.

acceptable population equation.

estimated statistic or desired variability.

acceptable sample error.

Question 8

If you were conducting a telephone survey of households using random digit dialing numbers and you determined that you needed a sample size of 1,100, which of the following would be most accurate?

You would need to obtain exactly 1,100 telephone numbers to call.

You would need to obtain far less than 1,100 telephone numbers because you know that many will not answer or cooperate anyway.

You will need some multiple of the 1,100 numbers in order to ensure you account for factors such as numbers that are for business phones, ineligible households (incidence rate), and those numbers dialed whose owners refuse to participate.

You will need only a few extra numbers to allow for those who have moved away.

Question 9

_________ is a form of logic in which you make a general statement about an entire class based on what you have observed about a small set of members of that class.

Inference

Variance

Median

Range

Question 10

A relationship in which the presence (or absence) of one variable is systematically associated with the presence (or absence) of another is:

causal relationship.

linear relationship.

monotonic relationship.

nonmonotonic relationship.