stat

cluster sample

• Subjects are selected by using an intact group that is representative of the population.

• Subjects are selected by dividing up the population into groups (strata), and subjects are randomly selected within groups.
  

• Subjects are selected by using every kth number after the first subject is randomly selected from 1 through k.

• Subjects are selected by random numbers.
  

random sample

• Subjects are selected by random numbers.

• Subjects are selected by using every kth number after the first subject is randomly selected from 1 through k.

• Subjects are selected by dividing up the population into groups (strata), and subjects are randomly selected within groups.

• Subjects are selected by using an intact group that is representative of the population.

systematic sample

• Subjects are selected by using every kth number after the first subject is randomly selected from 1 through k.
  

• Subjects are selected by random numbers.

• Subjects are selected by dividing up the population into groups (strata), and subjects are randomly selected within groups.

• Subjects are selected by using an intact group that is representative of the population.

stratified sample

• Subjects are selected by dividing up the population into groups (strata), and subjects are randomly selected within groups.

• Subjects are selected by using an intact group that is representative of the population.

• Subjects are selected by random numbers.

• Subjects are selected by using every kth number after the first subject is randomly selected from 1 through k.

A ___variable is one that influences the dependent or outcome variable but was not separated from the independent variable.

• independent variable

• confounding variable

The ___ variable in an experimental study is the one that is being manipulated by the researcher. The ___ variable is also called the explanatory variable.

• confounding variable

• independent variable

___are variables that can be placed into distinct categories, according to some characteristic or attribute.

• qualitative variables

• quantitative variables

____assume values that can be counted.

• Discrete variables

• Continuous variables

___can assume an infinite number of values between any two specific values. They are obtained by measuring. They often include fractions and decimals.

• discrete variables

• continuous variables