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• Level: GCSE
• Subject: Maths
• Word count: 6405

# we can see if there is any correlation between a person's height and weight because if no correlation is present: Mayfield High School

Extracts from this document...

Introduction

Data handling coursework: Mayfield High School

Mayfield School is a secondary school of 1183 pupils aged 11-16 years of age. For my data handling coursework, I am going to investigate a line of enquiry from the pupils' data. Some of the options include; relationship between IQ and Key Stage 3 results, comparing hair colour and eye colour, but I have chosen to investigate the relationship between height and weight. One of the main reasons being that this line of enquiry means that my data will be continuous (numerical), thus allowing me to produce a more detailed analysis rather than eye or hair colour, where I would be quite limited as to what I can do because the data is discrete. I think that this will be a more varied investigation unlike the relationship between eye colour and hair colour, as it is pretty random which colour eyes and hair you have and does not have anything in common.

All the information given to us is too much to use, and therefore I have selected only a small amount of data for each student, which will be relevant to the height and weight of each student.

My variables only looking at height and weight so I have deleted all the other variables besides: name, age, gender, height, weight together with method of getting to school, how far away they live from school and favourite sport since I could use all the information to extend my enquiry and could be significant when looking at height and weight.

## Pre-test

We do a pre-test so we can see if there is any correlation between a person’s height and weight because if no correlation is present, there is not any point in continuing with the investigation.

Middle

-1     0       1

My correlation was here (0.5), this is a positive correlation and is in                                                                          the middle of 0 and 1 therefore there is a positive and medium correlation between height and weight.

 x x² 1.30 1.69 1.42 2.02 1.42 2.02 1.42 2.02 1.44 2.07 1.45 2.10 1.45 2.10 1.45 2.10 1.50 2.25 1.51 2.28 1.52 2.31 1.52 2.31 1.52 2.31 1.54 2.37 1.55 2.4025 1.55 2.4025 1.55 2.4025 1.55 2.4025 1.55 2.4025 1.55 2.4025 1.56 2.4336 1.57 2.46 1.57 2.46 1.57 2.46 1.57 2.46 1.58 2.50 1.58 2.50 1.59 2.53 1.60 2.56 1.60 2.56 1.61 2.59 1.62 2.62 1.63 2.66 1.64 2.69 1.65 2.72 1.65 2.72 1.68 2.82 1.68 2.82 1.68 2.82 1.69 2.86 1.69 2.86 1.69 2.86 1.70 2.89 1.70 2.89 1.71 2.92 1.71 2.92 1.71 2.92 1.71 2.92 1.73 2.99 1.74 3.03 1.75 3.06 1.76 3.0976 1.77 3.13 1.78 3.1684 1.79 3.20 1.80 3.24 1.80 3.24 1.83 3.35 1.85 3.42 1.86 3.4596

Working out the standard deviation of the 60 students heights in years 7-11.

x = 97.16   x² = 158.22

x = Height (m) therefore x² = Height (m)²

∑= sum of

_____________

S.D. =  √∑x²   -    ∑x²

n            n²

_____________

=  √ 158.22  -  97.16²

60            60²

__________________

=  √ 158.22  -  9440.0656

60

3600

_________________

=  √  2.636987 - 2.62223936

________

=√0.014748

0.1214413 = Standard Deviation

0.014748 = Variance (The variance is just the standard deviation before you square route it)

Standard deviation is calculating weather your mean is accurate and good for a correlation. The nearer the standard deviation is to 0 the more good and reliable the mean is. Standard deviation works out how much either side of the mean can be accepted to be as the mean. For example say the mean was 5 and the standard deviation was 0.5 the mean can then be seen to be anything from 4.5 – 5.5. In my case my total mean of the samples is 1.63; meaning anything between 1.5085587 and 1.7514413 will numbers that will be covered.

Not only by working out the standard deviations you can see how good your mean is, you can also see if you have come across any anomalies.

Mean = 1.63 S.D= 0.1214413

1 S.D:

1.63 +  0.1214413 = 1.7514413

1.63 -   0.1214413 = 1.5085587

1.5085587 – 1.7514413

The number of students in the range (1.5085587 – 1.7514413) divided by the total amount of students (60) x by 100 = 72% of the students heights covered.

2 S.D:

1.63 + 2(0.1214413) = 1.8729        you do two lots of the standard deviation

1.63 -  2(0.1214413) = 1.3871        because you are working out 2 standard

deviations

1.8729 - 1.3871

The number of students in the range (1.8729 - 1.3871) divided by the total amount of students (60) x by 100 = 98 % of the students heights covered.

Working out the standard deviation of the 60 students weights in years 7-11.

 x x² 26 676 33 1089 35 1225 36 1296 38 1444 40 1600 40 1600 42 1764 42 1764 42 1764 43 1849 45 2025 45 2025 45 2025 45 2025 46 2116 46 2116 47 2209 47 2209 47 2209 48 2304 48 2304 48 2304 48 2304 48 2304 48 2304 49 2401 49 2401 49 2401 50 2500 52 2704 52 2704 52 2704 54 2916 54 2916 55 3025 55 3025 55 3025 56 3136 56 3136 56 3136 56 3136 57 3249 58 3364 58 3364 58 3364 59 3481 59 3481 60 3600 60 3600 60 3600 60 3600 61 3721 62 3844 62 3844 64 4096 65 4225 67 4489 70 4900 75 5625

x = 3083  x² = 163567

x = Weight (kg) therefore x² = Weight (kg)²

∑= sum of

_____________

S.D. =  √∑x²   -    ∑x²

n            n²

_____________

=  √ 163567 -  3083²

60            60²

_______________

=  √ 163567  -  9504889

60              3600

____________________

=  √2726.116667 – 2640.246944

_________

=85.869723

9.266591768 = Standard Deviation

85.

Conclusion

The mode in each year also increases; Year 7 – 45 kg, Year 8 – 49 kg and so on. (You can clearer see by looking at the table). Again, until year 10 where it goes up to the highest mode 60 kg it then decreases in year 11 where it drops as low as 48 and 56 kg. This also adds to the fact that only to an extent about the older you are in school years the more you will weigh.

The median is also increasing in every year that goes up; it ranges from in year 7 – 45 kg year 10 – 57.5 kg. Furthermore, in this case the medium for year 10 is higher than the year 11’s median of 56kg. This is also another factor which helps to prove that my hypothesis was wrong to an extent.

 Year 7 Year 8 Year 9 Year 10 Year 11 Years Totalled Upper Quartile(kg) 59 64 70 75 67 75 Lower Quartile(kg) 38.5 48 47 54.5 54 45.75 Inter Quartile Range (kg) 20.5 16 23 20.5 13 29.25

From the graph above there is a clear indication that overall the older you are in school years, the taller you are.

Again in the graph below there is an obvious view that the taller you are year of school most likely the taller you are going to be. This shows that my hypothesis is correct because I predicted that the older you are in school years the taller you will be.

From the graph above there isn’t really any indications of the relationship between years 7-11, whereas the graph below show that the height goes up as the year group goes up till year 11 where there is a decrease in weight.  This shows that my hypothesis is wrong to extent because I predicted that the older you are in school years the more you will weigh, and quite clearly this is wrong to an extent.

This student written piece of work is one of many that can be found in our GCSE Height and Weight of Pupils and other Mayfield High School investigations section.

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