Author Question: A true experimental design is one where the researcher is able to eliminate all extraneous variables ... (Read 38 times)

mpobi80 · **on:** Jun 29, 2018

A true experimental design is one where the researcher is able to eliminate all extraneous variables as competitive hypotheses to the treatment, at least in theory.

Indicate whether the statement is true or false

Question 2

Name and describe the types of probability sampling.

cuttiesgirl16 · **Reply #1 on:** Jun 29, 2018

Answer to Question 1

T
True experimental designs, at least in theory, rule out all of the threats to internal validity.

Answer to Question 2

Probability sampling techniques are:
(1) Simple random sampling - assures each element in the population of an equal chance of being included in the sample.
(3) Systematic sampling - a starting point is selected by a random process and then every nth number on the list is selected.
(3) Stratified sampling - simple random subsamples that are more or less equal on some characteristic are drawn from within each stratum of the population.
(4) Cluster sampling - the primary sampling unit is not the individual element in the population but a large cluster of elements and clusters are selected randomly.
(5) Multistage area sampling - involves using a combination of two or more probability sampling techniques.