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Brenden Strom Physics lab 1251 9/14/23 Do two people have the same reaction time? During this investigation we are measuring if two people have the same reaction time by taking two random people and doing a reaction test 15 times to measure the average of their times. Reaction time is a measurement of how quickly you can identify a signal and produce a response. There are many variations of uncertainties that can play into the measurement values like distractions, errors, and mishaps. There are many things you can do to reduce statistical errors like taking more samples, disregarding the errors, or just letting them be and seeing how they affect your measurement. We use the standard error as our best estimate of the uncertainty of the mean. We are also looking for any discrepancies that many be in the measurement because they can determine whether the measurement values are the same or different. The guiding questions relates to all the key scientific concepts because when you are measuring reaction time of two different people, you must get all the data including errors, averages, estimates, and uncertainties because then you have samples and proof to show that two people either can or can not have the same reaction time. We completed our investigation by using the online reaction test that was provided to us in the lab manual. The times for the two people are measured 15 separate times each (in m/s). We wanted the tests to be as random as they could be just so we have a good result, so we started by choosing a number 1-4 out of our group and then we let Siri pick a random 1-4 number twice. Those two people then took the reaction test 15 times each and we recorded each time they had. We made the test a little more challenging by making the star you had to click on, pop up in random spots so you are not expecting it to be in the same place. We thought that would make it a little more realistic because when

you react to something you might not always be focused on it already. We made sure we had consistent measurements/ reducing error by going outside into the quiet hallway where we did not have any major distractions, and we also disregarded the times where the computer clicker malfunctioned so we could have accurate results. Our claim to answer the guiding question “do two people have the same reaction time” was that they do have the similar reaction time. Not everyone will have the same exact reaction time, but they can be very close to each other after doing research. According to our data that we collected, Person 1 had an average of .1057 m/s, a STDev of .149 m/s, and a standard error of .0379 m/s. Person 2 had a average of .1428 m/s, a STDev of .227 m/s, and a standard error of .0715 m/s. Our best estimate and uncertainty for Person 1 was (0.11±.04) m/s and for Person 2 it was (0.14±.07). We know the values are the same because the discrepancy equals .03 m/s and the total uncertainty is .11 m/s. If the discrepancy is less than the total uncertainty, then the data is the same. But if the discrepancy is greater than the uncertainty, then it is different. With the total uncertainty being higher than the discrepancy in our data, we concluded that the values are considered the same. Table 1 Average STDev ST Error Uncertainty Person 1 .11 m/s .15 m/s .04 m/s (.11±.04) Person 2 .14 m/s .23 m/s .07 m/s (.14±.07) Table to show our data we collected during the investigation. When we did our argumentation and we got to go to other groups to see their experiment we got to see a couple different things. One group had reaction times that were the same and another group had different results. The group with the same reaction results did it by using a ruler and dropping it to find their reaction time and the group with the different reaction times also did the ruler drop method. I believe that if they did their investigation right then the results, they got are good. Some

people have the same reaction time, and some people don’t, so I don’t disagree with the group that has different reaction times because that is what they found out through trials. In conclusion, the reaction time test my group did led us to the result that the two people did have the same rection time.

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