Experimental Design

Question 0

Stratified sample

Answer 0

Group homogeneous groups then take a random sample from each group

Question 1

Simple random sample

Answer 1

Randomly pick from everyone (need a list of everyone)

Question 2

Cluster sample

Answer 2

Group by location then randomly select some locations and use everyone in that location

Question 3

Systematic sample

Answer 3

Pick a random place to start and sample every 4th person after that
(Don’t need sampling frame)

Question 4

Completely randomized

Answer 4

Randomly assign treatments to experimental units

Question 5

Blocked design

Answer 5

Group experimental units into homogeneous groups them randomly treatments in each group

Question 6

Matched pairs

Answer 6

Group two like experimental units together an have one do one treatment and one do the other
Have one do two treatments compare the results

Question 7

Difference between experimental design and observational study

Answer 7

Experimental design you do something to the units and observation you don’t

Question 8

Increasing sampling size

Answer 8

Decreases variation

Question 9

Randomization reduces

Answer 9

Bias, but it does not eliminate

Question 10

Stratification reduces

Answer 10

Variation

Question 11

What is a confounding variable

Answer 11

Something that will effect results of experiment

Question 12

Booking is a type of experimental design, it happens

Answer 12

Before you assign treatments

Question 13

Having more then one treatment group does not mean the experiment is

Answer 13

Blocked

Question 14

The principles of design

Answer 14

Control randomization replication

Question 15

Placebo

Answer 15

Fake treatment (does nothing

Question 16

Blinding is when

Answer 16

Experimental unit doesn’t know

Question 17

Double blind is when

Answer 17

Experimenter and experiment unit do not now

Question 18

Well designed experiment only shows

Answer 18

Cause and effect

Question 19

Observational study and correlation does not

Answer 19

Show cause and effect

Question 20

In simple random sample

Answer 20

Every sample has same chance of being poked

Question 21

Types of bias

Answer 21

Voluntary response 
Non response 
Under Coverage
Convenience sampling 
Response bias

Question 22

What is an experimental unit

Answer 22

The single individual to which the treatments are assigned

Question 23

What is a factor

Answer 23

It is the explanatory variable

Question 24

What is a level

Answer 24

It is a specific value for the factor

Question 25

What is the response variable

Answer 25

It is what you measure

Question 26

Statistical advantage of stratified random over simple random is

Answer 26

It reduces variation

Question 27

The use of an extraneous variable to control the placebo effect is (important or not important in the design of the experiment)

Answer 27

Not important