Controlling Extraneous Variables Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

How can we control ppt variables?

A
  1. Same ppts in both conditions
  2. Match ppts in both conditions based on characteristics
  3. Random allocation
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

How does “Same ppts in both conditions” help control evs?

A

Data for each ppt is compared across both conditions, so prevents characteristics skewing results

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

How does “Match ppts in both conditions based on characteristics” help control evs?

A

Gives 2 sets of ppts that are as similar as possible

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

How does “Random allocation” help control evs?

A

Randomly assign ppts to diff conditions - distributes characteristics across conditions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

How can we control SITUATIONAL variables?

A
  1. Standardised procedure - same across all conditions
  2. Counterbalancing
  3. Random allocation
  4. Single-blind technique
  5. Double-blind technique
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

How does counterbalancing prevent sit.v?

A
  1. Prevents order effects

2. Split ppts in 1/2 - one half experience condition A THEN B. the other half vice versa

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

How does random allocation prevent sit.v?

A
  1. Randomly assign ppts to a condition

2. Pretext to counterbalancing; prevents order effects

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

How does a single-blind technique prevent sit.v?

A
  1. Prevents demand characteristics

2. Aims + info of procedures are withheld from ppts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

How does a double-blind technique prevent sit.v?

A
  1. Prevents demand characteristics ENCOURAGED BY investigator effects
  2. Ppts AND researchers involved in data collection/ppt interaction don’t know aims
    • hire an independent researcher
How well did you know this?
1
Not at all
2
3
4
5
Perfectly