The Crab Nebula Is the Result of a Supernova Explosion

question 328

Multiple Choice

The Crab Nebula is the result of a supernova explosion of a star that occurred at a distance of about 1.84 kpc from Earth.If people first saw the explosion in a.d.1054,when did the explosion actually occur?

• A) about a.d.1048
• B) 786 b.c.
• C) a.d. 1054, of course
• D) about 4946 b.c.

---

Definitions:

Coefficient Alpha

A statistical measure used to assess the reliability or internal consistency of a test or scale.

Kuder-Richardson

A set of formulas used to assess the reliability of binary (e.g., true/false, yes/no) scored tests or items within tests.

Low Validity

refers to the situation where a test does not accurately measure what it is supposed to measure, indicating a weak relationship between test scores and the intended construct.

Item Characteristic Curve

A graphical representation that shows the probability of a respondent answering a test item correctly at different levels of ability.