Tell Whether the Statement Is True or False $\{ 7,9,10,12 \} \cup \varnothing = \{ 7,9,10,12 \}$

question 135

True/False

Tell whether the statement is true or false.
- $\{ 7,9,10,12 \} \cup \varnothing = \{ 7,9,10,12 \}$

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Definitions:

Stanines

Derived from the term “standard nines,” this is a standardized score frequently used in schools. Often used with achievement tests, stanines have a mean of 5 and a standard deviation of 2, and range from 1 to 9.

T-scores

Standardized scores with a mean of 50 and a standard deviation of 10, used to compare an individual's score against a normative sample.

Grade Equivalents

A metric used in education to compare a student's test score with the average scores of students in other grades.

NCEs

Normal Curve Equivalents, a type of standardized score used in educational assessments to compare student performance across different age groups and grades.