M2 - 19 Sampling

Question 1

Target population vs sampling

Answer 1

Population = everything or everyone that you want to understand
Sample : small group that represents your population

Question 2

What is the good question in sampling, and what does it lead to

Answer 2

External validity
Can you extrapolate your results back to the population

Question 3

What is the purpose of sampling?

Answer 3

Obtain a subset of individuals or entities that is representative of the broader population so that findings can be generalized

Question 4

What is the concept of determining sample size?
A and B, P__ C__

Answer 4

Once you have an understanding of alpha and beta you can use power calculation to determine sample size you would’ve needed

Question 5

What are the stages of sampling (finding participants) ?
De___ p__ of Co____ and In___
Sp___ p___ and S___ Me___
De____ S___ S___
Im___ S___ P___

Answer 5

Defining population of concern and interest
- mean and variance
Specify procedure
Specify sampling method
Determine sample size
implement sample plan

Question 6

Sampling bias
One C____ is ov__w___
When does it occur?
Occurs when o___ or u___ re___ ce___ se___ of po_____

Answer 6

One condition is over weighted
conscious or unconscious
impartial method required
Occurs when sample systematically over or under represents certain segments of the population

Question 7

Target vs Accessible population

Answer 7

Target = overall group where researchers generalize findings
Accessible = portion of target population that has a chance

Question 8

Inclusion vs exclusion criteria
In__ pr__ tr__ of t__ and Ac___ po___
Ex___ fa__ th__ wo___ ex__ so___ fr___ be___ a su___

Answer 8

Inclusion = primary traits of target and accessible populations
Exclusion = refers to those factors that would exclude someone from being a subject

Question 9

4 types of Probability sampling?
Si_ R__
Sy___
St__ R___ S
Cl__ S__

Answer 9

Simple Random
systematic
Stratified random sample
Clustered sampling

Question 10

Randomness definition
Random S__ and As__

Answer 10

Mathematical probability (equal likelihood)
Random selection (external validity)
Random assignment (external validity)

Question 11

What is random sampling (probability sampling) ? What does it enhance?
Ev___ m___ of po___ e___ c___ of be___ se___
E___ V___

Answer 11

Every member of population equal chance of being selected
Enhances external validity

Question 12

What is non-random, Non-probability sampling? What can they introduce?

Answer 12

Do not involve randomness, can introduce sampling bias