Test yourself with the skills you have acquired so far
Who uses SQL for which purpose?
Database administrators to manage the data
Web-developers to code Websites
Humans to work with data stored in a relational database
What is SQL used for?
To retrieve data from a non-database environment
For web shop payments
To create and delete data in a database
Which keywords can start a SQL statement?
SELECT
WHERE
FROM
Why is version control important?
Develop a program with a team in a traceable process
Needed for selling the project
Quick develop code
Who can use GitHub?
Everyone who has bought it
Everyone with a Git account
Only trained developers
What is a branch?
A licensed company
A copy of the original project
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 project report
Create a file where you can insert all the codes
Do you use the command to create a pie chart in R?
pie
barplot
scatterplot
LDA is a statistical technique that allows for:
Predicting class membership
Classification of data into groups
Both answers are true
Assumptions required to apply LDA for predictive purposes are:
Both answers are true
Multivariate normality across groups
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:
The sampling technique applied
The margin of error and the confidence level
Both answers are true
Proportional allocation distributes sample size across strata basing on:
The mean value on each stratum
The variance in each stratum
The size of each stratum