Sunday, October 20, 2019

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

Do Left and right Do Left and right-handed people have roughly the same reaction time with their dominant hand Essay Do Left and right-handed people have roughly the same reaction time with their dominant hand Essay 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) Because we are dealing with people we can use decimals so we have to round the decimals. The ratio comes to 3:27 This means we have to choose 3 left handed people and 27 right handed people (the ratio should add up to 30). Because we are using stratified random sampling we cannot just pick the data ourselves, we have to use a calculator. You type in Ran# (number of sample, which in this case is 30). In order not to get decimals you must put it on fix mode. My stratified random samples are numbers: Left; 3, 9 and 8 Right; 181, 150, 226, 110, 120, 89, 169, 132, 98, 109, 95, 47, 5, 105, 113, 195, 191, 193, 149, 214, 9, 221, 258, 51, 189, 185 and 247. Averages In order to find the averages you have to add up the first, second and third attempt, then divide by number of attempt, which are 3. Left handed averages with dominant hand (samples): 0.64 seconds 0.27 seconds 0.27 seconds Right handed averages with dominant hand (samples): 0.25 seconds 0.18 seconds 0.25 seconds 0.30 seconds 0.38 seconds 0.19 seconds 0.42 seconds 0.33 seconds 0.39 seconds 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. Hypothesis 2 I predict that if you have a fast reaction time with your right hand you will have a fast reaction with your left and vice versa. Plan In order to prove my hypothesis I am going to do a random sample, using 50 pieces of data. I will draw a scatter graph to see whether my hypothesis is true. In order to draw my scatter diagram I must take both left hand and right hands averages and plot them against each other. For example if my right hand average was 0.63 seconds and my left was 0.54 I would plot 0.63 across the right hand axis (which we could say would be x) then from 0.54 I would go up and plot 0.63 across the left hand axis (which would be y). from this graph I hope to see whether there is negative/positive correlation or if there is none. Random sampling In order to random sample I will have to use my calculator. To do this you have to type in Ran#(total data-300) 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.

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