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Q: Why are data tables used in controlled experiment?
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Why are data tables used in a controlled experiment?

to help record your informantion


How are data tables and graphs used?

ok they are used by lines and dots and boxes to help you scientifically.


What can be used to show a cause and effect between two variables?

A controlled experiment can be used to show a cause and effect relationship. ex: an experiment studying the effect of a certain medicine on patients.


Is a data table the same as a database?

No. A table is the primary object used within a database to store data. A typical database will consist of many tables.


What is the meaning of normalized data in data warehouse?

Data warehouses are designed for quick access to large amounts of historical data. Read operations dominate over write operations. Under these conditions, normalization takes a back seat to performance optimization. A different design methodology, called dimensional design is used when planning a data warehouse. There are two common categories of schemas used in data warehousing: star schemas and snow flake schemas. A star schema has a central fact table, surrounded by dimension tables. The fact table contains columns called measures, which are aggregated in queries. The fact table is related to the dimension tables. The dimension tables may have levels, which are implemented as columns. For example, a dimension table named Location may contain columns for Continent, Country, StateProvince and City. This dimension table is not normalized. If you normalize the dimension tables, then each level is placed in its own table. Normalizing the dimension tables results in a snow flake schema.