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# Mathematic SL IA -Gold medal height (scored 16 out of 20)

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Introduction

Mathematics Standard Level Portfolio

Type 2- gold medal height Candidate name: Sun Ha (Rucia). Park

Candidate number:

School: Beijing No.55 High School

Content

Introduction

Introduction

Olympic Game is a variety competition of various athletics. It is composed twice a year, summer and winter, and it is hold once four year. Because there are many athletics competitions, it’s a great opportunity to take numerical data. In this task, I will investigate the winning height for the men’s high jump in the Olympic Games.The high jump is a track and field athletics plays in which athletes jump over a horizontal bar placed at measured heights without any aid of certain devices.

I m going to use Microsoft Excel and the graphing calculator TI-84 to collect and present the data for analysis and investigation, and find out the best –fit functional curve to the original data.

The table has given the original numerical data of the height achieved by the gold medalists at various Olympic Games.

 Year 1932 1936 1948 1952 1956 1960 1964 1968 1972 1976 1980 Height (cm) 197 203 198 204 212 216 218 224 223 225 236

Depending on the data, I will investigate this case by setting time of Olympic for my independent variable, and setting the winning height for my dependent variable. In graphs I will show, I let x denote time of Olympic and y denote the winning height. The domain for the data is {

|1932 ≤ x ≤ 1980} and the range for the data is {

|197 ≤ y ≤ 236}.

Before graphing the data, note that the Olympic Games were not held in year 1940 and 1944 because of the wars. In addition, I will change the year values to smaller values by using the 4 years gap between the times of Olympic. I was going to set 0 value for

Middle

Y

cubic function model 2

Difference value

(Y2-Y)

36

197

203.6919

6.691932

40

203

203.0005

0.00052

52

198

206.6406

8.640584

56

204

209.1492

5.149182

60

212

212.0006

0.00064

64

216

215.0121

-0.9879

68

218

218.0007

0.000709

72

224

220.7836

-3.21639

76

223

223.1779

0.177935

80

225

225.0008

0.00084

84

236

226.0695

-9.93054

Note that red colored points have the difference value greater than 6.

 X 36 40 52 56 60 64 68 72 76 80 84 Y 197 203 198 204 212 216 218 224 223 225 236

At the last test of cubic function model, I decided to choose middle points of the data given. I will choose the middle point first two data. Because in figure 1, we can see that these two points have relatively lesser gap in x value, than the gap of x value between the second point (40, 203) and the third point (52, 198). And then, I will separate other data into 3 groups of 3, and figure out the middle points.

For finding middle point between two points, we should use;

( , )

For finding middle point among three points;

( , )

The points are:

Point 1: ( , ) = (38, 200)

Point 2: ( , ) = (56, 204.67)

Point 3: ( , ) = (68, 219.33)

Point 4: ( , ) = (80, 228)

Suppose the function is: Given that 4 points are (38, 200), (56, 204.67), (68, 219.33), and (80, 228)

Substitute the points into the equation, and I got; For using matrix, we should know

, and we have; Let A = ,  X=

and  B= = By Graphing Calculator (GC), the solution is (remain to 6 significant figures);

So, the cubic function model 3 is,

y= Figure 10 The red points show original data, and the blue curve is the cubic function curve.

 X Y cubic function model 3 Difference value(Y2-Y) 36 197 202.3771 5.377113 40 203 198.3665 -4.63348 52 198 200.7111 2.711055 56 204 204.6733 0.673318 60 212 209.4203 -2.57972 64 216 214.4685 -1.53147 68 218 219.3347 1.334676 72 224 223.5353 -0.4647 76 223 226.587 3.586995 80 225 228.0064 3.00636 84 236 227.31 -8.69001

Note that red colored points have the difference value greater than 6.

 Cubic model 1 Cubic model 2 Cubic model 3 The model has least difference -0.00042 6.691932 5.377113 Model 1 -3.14812 0.00052 -4.63348 Model 2 10.2765 8.640584 2.711055 Model 3 7.15856 5.149182 0.673318 Model 3 2.13652 0.00064 -2.57972 Model 2 1.245763 -0.9879 -1.53147 Model 2 2.521673 0.000709 1.334676 Model 2 -0.00037 -3.21639 -0.4647 Model 1 4.715028 0.177935 3.586995 Model 2 6.70324 0.00084 3.00636 Model 2 -0.00035 -9.93054 -8.69001 Model 1

Note that red colored points have the difference value greater than 6.

The table above shows the difference value of y and y2 in three different cubic models which have used three various sets of points. We can see that, although the third model has only one difference greater than 6, the model 2 has the least difference among three of them with the least differences in 6 data among 11 data given. Therefore, I will choose the second model as the representative model of cubic function.

1. Consider quartic function;

The general form of quartic function is: As I solved the cubic function by matrix, I am going to find out the coefficient a, b, c, d and constant e in matrix again.

Since there are 5 unknown variables, I have to determine what 5 points going to choose. Still, I will pick the first and the last points, and the point listed in middle.

 X 36 40 52 56 60 64 68 72 76 80 84 Y 197 203 198 204 212 216 218 224 223 225 236

I will try two times to test the quartic function. I will fix these three points, and I am going to set three different sets of two points. First time, I will choose point (52, 198) and (76, 223). Second time, I will take two middle points solved by using 4 points each. The 4 points are the points colored in black in the table.

• Suppose the function is: Given that 5 points are (36, 197), (52, 198), (64, 216), (76, 223) and (84, 236)

Substitute the points into the equation, and I got; For using matrix, we should know

, and we have; Let A = ,  X=

and  B= = By Graphing Calculator (GC), the solution is (remain to 6 significant figures); So, the quartic function model 1 is, Figure 11 The red points show original data, and the blue curve is the quartic function curve.

 X Y Quartic function model 1 Difference value(Y2-Y) 36 197 197.0032 0.003242 40 203 187.8395 -15.1605 52 198 198.0059 0.005879 56 204 205.1456 1.145622 60 212 211.3791 -0.62088 64 216 216.0088 0.008769 68 218 218.9846 0.984585 72 224 220.9042 -3.09579 76 223 223.0129 0.012892 80 225 227.2035 2.20352 84 236 236.0166 0.01659

Conclusion

Since the original curve is looked like a linear functional curve, I tried to find the trend curve by using MS excel;

In figure 16, Except for the some fluctuation points, the linear functional curve is quite fit to the all data. It has Pearson correlation value of 0.9289, and it’s quite close to 1. Therefore, the linear function is the final model for best-fit functional curve to the original graph.

Figure 16 the original graph and its trend shown.

My investigation started from analyzing the given data, and I developed it one after another. For the first, the task is analyzed based on the limited number of the data given. I tried the sine and cosine functional curves first, quadratic function curve next and then tried linear function curve by using characteristics of functions. Because the functions I mentioned were not fit to the data given, I tried to consider the cubic and quartic functions to figure out the best-fit functional form. I tested three different cubic models and two different quartic models. I made the models to have different points so that able to find the model which is closest to the original data. For the limited number of data given, I found that the quartic function, especially for the quartic model 1 is the best- fit functional curve. However, when I attempted to check whether the quartic model is fit to the other data or not, I discovered that my function model curve was only fit to the data which is limited, given first. I used the data, include the second data set, or the data given later, I drew out the graph to notice the trend. Eventually, I saw that the trend was more likely to the linear functional curve. Although the gradient of the curve is not constant, the data has increasing trend. Therefore, in short, through the processes, I got my best-fit function curve, which is linear functional curve.

This student written piece of work is one of many that can be found in our International Baccalaureate Maths section.

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