Samping and Assignment Flashcards

1
Q

Probability Sampling

A

Results in more representative samples
Randomization occurs at some point
Decrease in sampling error

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2
Q

Nonprobability Sampling

A

May over or under represent the population
No randomization
Increase sampling error
Is cheaper

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3
Q

Simple Random Sampling

A

Probability Sampling

  • each member of pop has a number and a random number generator is used for selection
  • each member has equal chance of being selected
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4
Q

Systematic Sampling

A

Probability Sampling

- every nth subject on sampling frame is used - starting point is picked with random number generator

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5
Q

Stratified Sampling

A

Probability Sampling

  • Randomly select from subjects in each subgroup
  • Ensures representation from each subgroup
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6
Q

Cluster Sampling

A
Probability Sampling
- Randomly select from a pocket of samples
2 stages (1 selected clusters and 2 within cluster) and then randomize within cluster
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7
Q

Convenience Sampling

A

Nonprobability Sampling

- Use of already available subjects

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8
Q

Snowball Sampling

A

Nonprob Sampling

  • Recruit subject that then recruits more subjects
  • Used when difficult to get sample
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9
Q

Purposive or Judgmental Sampling

A

Nonprob Sampling

- Researcher chooses sample based on who they think would be appropriate

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10
Q

Quota Sampling

A

Nonprob Sampling

Judgment used to select subjects from each segment based on specific properties (20 young and 20 older)

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11
Q

Goal of Randomization

A

Eliminate bias and generate a representative sample for comparison

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12
Q

Random Selection

A

is for selecting subject to be in a study

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13
Q

Random Assignment

A

is for assigning subject to experimental groups

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14
Q

Individual Assignment

A

Dice or coin toss

Can lead to unequal group sizes

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15
Q

Block Assignment

A

Predetermine # of subjects needed for each group and assign each member a number and then select subjects based on random generator

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16
Q

Systematic Assignment

A

Sub A = group 1
Sub B = group 2
Sub C = group 1
Sub D = group 2

17
Q

Matched Assignment

A

Subjects matched or formed into groups based on important characteristics

18
Q

Consecutive Assignment

A

Order of groups is assigned before subjects enrolled in the study and as subjects come in, they are assigned according to the previously composed list