Who uses SQL for which purpose?

Web-developers to code Websites

Database administrators to manage the data

Humans to work with data stored in a relational database

What is SQL used for?

For web shop payments

To create and delete data in a database

To retrieve data from a non-database environment

Which keywords can start a SQL statement?

FROM

WHERE

SELECT

Why is version control important?

Needed for selling the project

Develop a program with a team in a traceable process

Quick develop code

Who can use GitHub?

Only trained developers

Everyone who has bought it

Everyone with a Git account

What is a branch?

A copy of the original project

A licensed company

A specific project

How many windows does the working environment of R studio consist of?

4

3

None

R script allows you to:

Download a package

Create a file where you can insert all the codes

Create a project report

Do you use the command to create a pie chart in R?

barplot

scatterplot

pie

LDA is a statistical technique that allows for:

Classification of data into groups

Predicting class membership

Both answers are true

Assumptions required to apply LDA for predictive purposes are:

Multivariate normality across groups

Both answers are true

equal variances-covariances across groups

Surveys based on samples:

Save resources if compared with a census-based survey

Allow for an exhaustive research in a population

Both answers are true

Sample size is affected by:

Both answers are true

The sampling technique applied

The margin of error and the confidence level

Proportional allocation distributes sample size across strata basing on:

The variance in each stratum

The size of each stratum

The mean value on each stratum