Use this website and do the following.

https://phet.colorado.edu/sims/html/wave-on-a-string/latest/wave-on-a-string_en.html

It is possible to calculate speed. Click the buttons on the bottom right to activate a stopwatch and a ruler. Use it to calculate the speed of a wave (speed = distance/time). Show your work. We have seen above that tension matters - tighter strings have faster waves. Does anything else effect the speed of the wave? Amplitude? Pulse width? Damping? Collect data to support your conclusions. Just like with the marble lab, you should be doing 3 trials of each, finding an average and finding the range over 2 error. Only once you have all of this data should you try to answer the question of whether or not any of the other changes impact speed.