Methods Of Collecting Data

Question 0

Why are complete censuses impractical

Answer 0

Time
Cost
Carelessness

Question 1

Census

Answer 1

A complete enumeration of an entire population

But still not completely reliable

Question 2

Goal of a sample

Answer 2

Gain info without disturbing or changing the entire population

Question 3

_________ are later undertaken to demonstrate relationships suggested by samples

Answer 3

Controlled experiments

Question 4

______ makes info impossible to obtain

Answer 4

Bias

Question 5

Main technique to avoid bias

Answer 5

Randomness

Question 6

Critical for representative data

Answer 6

Sample size, NOT percentage of the population

Question 7

Double blind experiment

Answer 7

Neither the patient nor the administrator knows the difference between the experiment and control groups

Question 8

Critical principles behind good experimental design

Answer 8

1. Control- conditions should be as similar as possible
2. Blocking- subjects can be divided into representative groups
3. Randomization
4. Replication- needs to be repeated for suffice not data
5. Generalizability- ability to repeat the experiment in a variety of settings

Question 9

Is it easier to conclude cause-and-effect relationships in experiments or observational studies?

Answer 9

Experiments

Question 10

Observational studies on the impact of some variable on another variable often fail because….

Answer 10

Explanatory variables are confounded with other variables

Question 11

Parameters

Answer 11

Estimated population characteristics

Question 12

Experiments involve….

Answer 12

Applying a treatment to one or more groups and observing responses

Question 13

Are sample surveys observational studies, experiments, or both?

Answer 13

Observational studies

Question 14

Who selects which groups people are placed in for experiments and observational studies?

Answer 14

Experiments: researchers

Observational studies: participants