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Designing an IQ Test

Designing IQ Test
How do IQ test creators come about creating an IQ test? What gives them inspiration on IQ test questions and answers they actually want to put in the test? Creating an IQ test would be difficult if basic steps are not followed. However, following these steps can make a big difference:

1. Norm phase
The norm phase is also called the standardization phase where obtaining a sample from the population of interest would serve as a criterion about judgements in order to categorize people within the IQ spectrum. For example, using mean amd standard deviation with regard to age, sex, ethnicity etc. However, to make an IQ test effective in measuring IQ (not necessarily intelligence), test creators have to develop different norms for different groups or better still, for different countries. This could help to minimize cultural bias.

2. Validity phase
Validity is the extent to which a test measures what it suppose to measure. Intelligence, right? How do psychometrists validate an IQ test? An IQ test can be validated by using the norm criterion and thereby ensuring different types of validity:

• content validity
• concurrent validity
• face validity
• cultural validity
• convergent validity
• discriminant validity

3. Reliability phase
Could the test produce the same results as it revealed previously? If yes, the test is reliable and if otherwise, the test isn't reliable but garbage; therefore, it doesn't really worth your time. How do scientists ensure reliability of a test? There are two most effective and popular methods for this:

• test-retest reliability
• split-half reliability

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