In a Database, a Key Is a Column or Group

question 58

True/False

In a database, a key is a column or group of columns that identifies a unique row in a table.

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Definitions:

Critical Value

A point on the scale of the test statistic beyond which we reject the null hypothesis; it's determined by the significance level.

Null Hypothesis

A statement suggesting that there is no significant difference or relationship between specified populations, any observed difference being due to sampling or experimental error.

Null Hypothesis

A statement in statistical hypothesis testing that assumes no effect or no difference between phenomena or populations.

Level of Risk

The probability or chance of experiencing harm or loss.