For which one of the following research situations would an independent-measures

Question

For which one of the following research situations would an independent-measures t test be most appropriate? A researcher wants to study whether a special diet can increase IQ in the US population over its current known mean of 100. A researcher wants to test whether race car drivers weigh less than marathon runners. None of these situations would use an independent-measures design. A researcher wants to study the effects of alcohol by comparing participants' reaction times before and after drinking.

Explanation / Answer

a researcher wants to test weather race car drivers weigh less then marathon runners. is correct choice

as here marathon runners and car drivers both samples are independent from each other.

while in first option we have only one sample and last choice contain dependent test

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