Shipley developed a NEW test to measure IQ. Using his test, someone with an IQ of 180 would be considered twice as intelligent as someone with an IQ of 90 and someone with an IQ of 90 was three times as intelligent as someone with an IQ of 30. Shipley's test treats IQ as a(n):.

ratio variable

Explanation:

Based on the information provided within the question it can be said that in this scenario Shipley's test treats IQ as a ratio variable. This means that it any two of the values used have meaningful ratio, allowing for the use of multiplication or division. For example if someone with an IQ of 90 was three times as intelligent as someone with an IQ of 30 it means that individual A's IQ (90) divided by 3 would equal the IQ of individual B (30).

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