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A researcher records how many hours subjects sleep and then records the time it takes these subjects to complete an agility test administered at 9 am each day. The independent variable is A. level of difficulty of the agility test B. amount of sleep OC. age of the subject D. score on the agility test

A researcher records how many hours subjects sleep and then records the time it takes these subjects to complete an agility test administered at 9 am each day T class=

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Solution

step 1

an independent variable is the cause while a dependent variable is the effect in a causal research study.

Step 2

The independent variable is amount of sleep

Final answer

amount of sleep

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