# Samenvatting Stats Data and Models

ISBN-10 1292022450 ISBN-13 9781292022451
126 Flashcards en notities
3 Studenten

# Onthoud sneller, leer beter. Wetenschappelijk bewezen.

## Dit is de samenvatting van het boek "Stats Data and Models". De auteur(s) van het boek is/zijn Richard D De Veaux. Het ISBN van dit boek is 9781292022451 of 1292022450. Deze samenvatting is geschreven door studenten die effectief studeren met de studietool van Study Smart With Chris.

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• ## 1 Stats starts here

• What is statistics?

A way of resigning, along with a collection of tools and methods, designed to help us understand the world.

• What are statistics?

• What are data?

Data are values along with their context.

• What is one of the interesting chalanges of Statistics?

Here can be more than one right answer.

• ## 2.1 But what are data?

• What do data contain?

Who, what, when, where (and if possible) Why. Often we add How to the list as well.

• What do the 'data questions' tell us?

What the context for the data values is.

• What items do you need at least to have data?

Who and what

• ## 2.2 Data Tables

• Why do we make data tables?

To organize the values and make the context of the data clear.

• ## 2.3 who

• What do rows of a data table correspond with?

Individual cases about Whom (or which- if they're not people) we record some characteristics.

• What are respondents?

• What are subjects?

People on whom we experiment.

• What are participants?

People on whom we experiment.

• What are experimental units?

Animals,  websites or other inanimate subjects on which we experiment.

• What are records?

Rows in a database

• What is another word for record?

Cases

• What is a sample?

Cases selected from some larger population.

• What does 'representative' mean?

The sample of a population is able to generalize  the larger population.

• ## 2.4 What and why

• What are variables?

• How do you really understand your variables?

Think about what you want to know.

• What do units tell you?

How each value has been measured.

• What is a categorial variable?

A variable that names categories and answers questions about how cases fall into those categories.

• What is a quantitative variable?

A measured variable with units answers questions about the quantity of what is measured.

• What should you do when it isn't clear if a variable is categorial or quantitive?

Think about Why you are looking at it and what you want it to tell you.

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