• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Human variation

Extracts from this document...


Is there a positive correlation between the height and hand span of 16 year old first year high school students? Human beings are different in many ways. The variation can be seen in physical traits such as strength, height, weight, skin color etc or in mental traits such as IQ. Therefore it is possible to measure these different characteristics and compare them with each other or relate them to one another. The aim of this experiment is to test the hypothesis that there is a positive correlation between the length of the hand span and height of a person. For this purpose the hand span and height of the first year high school students will be used. Hand span is the distance that is measured from the tip of the little finger to the thumb as seen in the picture below. Picture 1. Hypothesis: - There is a positive correlation between the length of a person's hand span and height. Materials: - Ruler, measuring meter, notebook, pen Independent variable: - hand span Dependent variable: - height Controlled variables: - age, gender, measurements, sampling Method 1. A first year student of age 16 was chosen in katedralskolan high school. ...read more.


the shape of the scatter graph indicates that there is a positive correlation between the two variables. Graph 2 shows also a strong correlation between the height and hand span of female students as most of the points are concentrated near the trend line. Some anomalies are present here as well such as a hand span of 19.2�1cm and height of 153.5�1cm. The range of data in Table 3 also shows that females have smaller hand span and height compared to males. The standard deviation calculated in Table 3 shows how widely spread the data points are around the average. The standard deviation for hand span is 1.6 for males and 1.1 for females. This indicates that hand span of the male students is relatively more varied than the female hand span. When it comes to height, the standard deviation for male students was found to be 6.8 while for female it was 6.4. Therefore again there is slightly more variation in the height of the male students compared to the female students. Graph 3 is a scatter graph representation of all the 54 samples measured from both male and female students. The majority of the points are clustered close to the trend line indicating a positive correlation. ...read more.


These two hormones regulate the development, growth, pubertal maturation, and reproductive processes of the body. In this experiment both male and females were used. All were at the age of 16 in which puberty is still taking place. So they have not achieved maximum growth at the time of measurements. It is also the case that females enter puberty earlier than males and even between males and females, the onset of puberty varies greatly. This in turn will greatly affect the results obtained. The timing of puberty and thereby growth of a person is also affected by environmental factors such as diet of a person. Another limitation in this experiment is the measurement of the hand span. The students were asked to place the tip of their little finger on a ruler as seen in picture 1 and stretch their hands. Using this method meant that the measurement relied heavily on the flexibility of the hands being constant amongst all those sampled. This was not the case all the time. Total number of samples was 52 only. Improvements: - instead of using teenagers to test the hypothesis adults of age 21 can be used since they have most likely attained their maximum growth. By taking more samples the uncertainty due to the measurement of the hand span can be reduced. ?? ?? ?? ?? ...read more.

The above preview is unformatted text

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

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related International Baccalaureate Biology essays

  1. Marked by a teacher

    Neurology and Behaviour. Focus question: Is there an increase in the perception and ...

    5 star(s)

    of several other studies in suggesting that females have stronger feelings of disgust than their male counterparts. This difference in the disgust response may not simply be due to the genetic composure of men and women but rather their trained responses or environmental factors which influence their behaviour and emotions.

  2. Genetic Variation

    Variation is important because without it, a species will be same all around with the same flaws and it will have less of a chance of survival. In order for there to be variation, there must be a population and not just a few individuals.

  1. The effect of pvc piping on the breathing/heart rates of male year 12 students

    This means that the heart needs to beat faster in order to transfer limited amounts of oxygen to the areas where it is required. It is a simple survival tool in which the body attempts to package small amounts of oxygen but move them faster to attempt to make up for what is lost.

  2. Allelopathy. Open Investigation Will increasing the number of allelopathic sunflower plants effect the ...

    height of the plant The location where the plants are left to grow The pots will be left in an undisturbed location where plants are able to attain full sunlight in the day. Prevent the interference of pests with the plant All plants will be inspected daily.

  1. Extended Essay: An Investigation Into the Differences In Life Expectancy For Males and Females ...

    I will visit Twickenham Cemetery and collect data showing the year of death, the age of the person at the time of their death, and the sex of the person, for two different time frames. The first will be 1900-1920 and the second will be 1980-2000.

  2. Research Question (RQ) How does the position of the arm (cuff) in relation ...

    After 3 minutes, the Blood Pressure of the subject was measured 3 times. The systolic and diastolic pressure values for these arm positions were then recorded in the paper data collection table under the heading - 'at heart level'. These values were measured while the subject was still standing.

  1. Sleep is a normal part of human life. Investigate the neurobiological basis of normal ...

    Moreover, the areas most important for judgement, impulse control, attention, and visual association are disproportionately hypometabolic compared to the primary sensory and motor areas necessary for receiving and acting upon the environmental inputs. This theory leads to the hypothesis that the areas of the brain most responsible for higher-order cognition are to some degree less functional during sleep-deprived waking activity.

  2. Examine the correlation between soil moisture at different heights up the slope and the ...

    This should be done for 30 seconds (in order for the reading to stabilise). This recording should be made at the site of every Bracken Fern that is measured and should be repeated 3 times, in order to guarantee a reliable reading.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work