Statistics Week 1

What is data?

• Experiments

• Information that can be analyzed to make decisions

• Collection of procedures

• Samples

Hypotheses are:

• Research objectives

• Questions

• Proven or disproven

• Supported or opposed

What is a population?

• Entire collection of units or individuals

• A subset of the population

• A representative sample

• A randomized sample

What is a sample?

• An individual

• A subset of the population

• The whole population

• The entire collection of units we want to study

It is possible to study the whole population?

• No; it is very unlikely

• Yes

A study design in which the treatment is not randomly assigned is

• Experimental

• Observational

• Causal

• Randomized

In a study with randomized assignment

• The participant chooses their intervention

• The investigator chooses the intervention for the participant

• Neither of these statement s is true

Causal links can be made in an observational study.

• True

• False

Bias in research is

• Deceit

• Any tendency that prevents unprejudiced consideration of a question

• Always intentional

• Always avoidable

A valid measure

• Measures what it claims to measure

• Is consistent

• Contains no measurement error

• Eliminates variability