Researchers are curious if streets where cars can travel faster are noisier. They randomly select 50...

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Researchers are curious if streets where cars can travel faster are noisier. They randomly select 50 city blocks and record the average speed (mph) of the vehicles and measure the noise level (decibel) on the street. What is the explanatory variable in this situation? Country Average speed City blocks Noise level Researchers are curious if streets where cars can travel faster are noisier. They randomly select 50 city blocks and record the average speed (mph) of the vehicles and measure the noise level (decibel) on the street. What is the explanatory variable in this situation? Country Average speed City blocks Noise level