When testing the effect of noise on the performance of a task, Marco tests half the participants in a cool, quiet room and the other half in a hot, noisy room. In this case, what confounding variable has Marco failed to eliminate?
A) Task performance
B) Noise level
C) Gender of participants
D) Room temperature

D) Room temperature

Explanation:

For the experiment to work and have good reliable results there should only be one variable. In this case, the variable is the noise level, and the different room temperatures would influence the experiment's results.

answer; earthquake;

the federal government of the united states was established by the constitution. us is a presidential republic. the president is head of state, head of government and of a two party legislative and electoral system. the supreme court balances the powers of the federal and the state government. yhe executive branch is headed by the oresident. there are two chambers of congress, the senate and the house of representatives. judicial power is exercised by the judicial branch (or judiciary), comprised of the supreme court and lower federal courts. the judiciary's function is to interpret the   constitution as well as the federal laws and regulations.