Assume You Are Using the UNION Operator to Combine the Results

question 51

Multiple Choice

Assume you are using the UNION operator to combine the results from two tables with identical structure,CUSTOMER and CUSTOMER_2.The CUSTOMER table contains 10 rows,while the CUSTOMER_2 table contains 7 rows.Customers Dunne and Olowski are included in the CUSTOMER table as well as in the CUSTOMER_2 table.How many records are returned when using the UNION operator?

• A) 7
• B) 10
• C) 15
• D) 17

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Definitions:

Simple Random Sample

A subset of individuals chosen from a larger set where each individual has an equal chance of being selected.

Sample Means

The average values obtained from multiple subsets of a population.

Unbiased Estimator

A statistical estimator that, on average, accurately reflects the parameter it estimates, meaning its expected value is equal to the true value of the parameter.

Standard Error

A statistical measure that quantifies the amount of variability in the sampling distribution of a statistic, often used in the context of mean or proportion.