Question
Solution
The standard deviation of a random variable cannot be negative. Standard deviation measures the dispersion or spread of the distribution and is always a non-negative value.
'Data modelling' means:
In a data warehouse, a fact table typically contains:
In a data cube, what does "slice" operation do?
Which OLAP operation involves focusing on a subset of dimensions (e.g., region=‘Asia’)?
Which OLAP operation allows drilling down into more detailed data?
Which of the following is a key process in ETL?
Which type of data warehouse is focused on specific business lines or departments?
Which type of OLAP allows analysis of multidimensional data stored in relational databases?
A star schema in a data warehouse consists of:
Which OLAP operation allows users to view data at different levels of granularity?
