Ch7 8

Question 1

“to a certain degree”, do not randomly assign subjects

Answer 1

Quasi Experiment Designs

Question 2

When random assignment is not possible, we should select subjects in some way that makes 2 groups as comparable as possible

Answer 2

Non-equivalent group designs

Question 3

examining series of observations on some variable over time

Answer 3

Time series designs

Question 4

series of observations is compared before & after some intervention is introduces

Answer 4

Simple interrupted time series

Question 5

selecting part of a population

Answer 5

sampling

Question 6

method of selection in which each member of a population has a known chance/ probability of being selected

Answer 6

Probability Sampling

Question 7

those selected are not typical or representative of larger population they have been chosen from

Answer 7

Bias

Question 8

Likelihood that any given element will be selected is Not Known

Answer 8

Non-Probability Sampling

Question 9

ex: list of 10000 elements and we want sample of 1000

Answer 9

Systematic Sampling example

Question 10

rather than selecting our sample from total population

Answer 10

stratified sampling

Question 11

Purposely produce samples not representative of population on some variable

Answer 11

Disproportionate Stratified Sampling

Question 12

Initial sampling of groups of elements (clusters) followed by selection of elements w/in each selected cluster

Answer 12

Multistage cluster sampling

Question 13

select sample based on knowledge of population & research goals

Answer 13

Purposive (aka judgmental Sampling)

Question 14

Begins w/table describing characteristics of target population we wish to represent, assign all persons in a given cell a weight appropriate to their portion of total population

Answer 14

Quota samping

Question 15

Surveys among students in class

Answer 15

Reliance on available subjects

Question 16

identify single subject or small # of subjects, then ask subjects to identify others like him/her who might be willing to participate

Answer 16

Snowball sampling