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# Do Left and right-handed people have roughly the same reaction time with their dominant hand.

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Introduction

Hypothesis 1 I predict that left and right-handed people will have roughly the same reaction time with their dominant hand. Plan In order to prove my hypothesis I am going to use stratified random sampling, so that I get a fair sample to conduct my study. I will find both the average and the range to see if my hypothesis is correct. Stratified Random Sampling I am going to use 30 pieces of data for my sample. I sorted the data excluding any that did not say what hand they used or used both hands as their dominant. Firstly I must find the ratio of left handed people to right: There are 300 pieces of data in total. There are 32 left handed people. And 268 right handed people. In order to find the ratio I have to divide the number of left handed people with the total number of people, and then I have to multiply the answer by 30. I have to do the same to the right. Left= 32 / 300 x 30 = 3.2 Right=268 / 300 x 30 = 26.8 The ratio is 3.2 : 26.8 (left : right) ...read more.

Middle

0.50 seconds 0.25 seconds 0.25 seconds 0.39 seconds 0.28 seconds 0.25 seconds 0.47 seconds 0.24 seconds 0.41 seconds 0.22 seconds 0.31 seconds 0.20 seconds 0.39 seconds 0.27 seconds 0.29 seconds 0.25 seconds 0.33 seconds To find the total average for the left / right hand you have to add up all your results and divide by number of results. Total left hand = 1.18/3 = 0.39 Total right hand =7.41/27 =0.27 From this I can see that right handed people have a quicker reaction time with there dominant hand than left handed people do. Range To find the range between the total right hand and the total left I must take the smallest one away from the biggest. Range = 0.39-0.27 =0.12 Although right handed people have quicker reaction times than left handed people do, it is not by much, there is only 12 hundredths between them. Conclusion From my study I can conclude that right-handed people are faster than left. But I think that my hypothesis is correct because I predicted that "left and right-handed people would have roughly the same reaction time with their dominant hand" and the difference between them is only 12 hundredths of a second. ...read more.

Conclusion

My Random samples are : Left hand average Right hand average 0.32 0.57 1.04 0.36 0.95 0.25 0.40 0.31 0.50 0.33 0.30 0.33 0.33 0.33 0.31 0.38 0.39 0.33 0.36 0.33 0.22 0.19 0.28 0.28 0.33 0.36 0.33 0.28 0.22 0.25 0.28 0.25 0.33 0.33 0.27 0.41 0.33 0.39 0.39 0.3 0.88 0.69 0.25 0.44 0.25 0.41 0.22 0.18 0.62 0.273333333 0.24 0.253333333 0.28 0.5 0.28 0.25 0.22 0.25 0.28 0.33 0.31 0.296666667 0.28 0.24 0.27 0.22 0.29 0.253333333 0.31 0.276666667 0.22 0.18 0.22 0.22 0.23 0.203333333 0.64 0.2 0.29 0.293333333 0.28 0.25 0.31 0.29 0.27 0.22 0.31 0.28 0.14 0.27 0.31 0.39 0.27 0.27 0.89 0.49 0.23 0.22 Scatter Graph From my graph I can see that there is little correlation. Although after looking at it for a little while I have come to the conclusion that you can see the majority of the points that are quick with there left hand are also quick with there right, but there are still a number of exceptions. Conclusion I have come to the conclusion that my hypothesis is not fully correct although, I can see that for the majority it is (the majority being roughly 60%) that it is correct. Key / = divide ?? ?? ?? ?? ...read more.

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