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

An investigation into the density of 'mock blood'

Extracts from this document...

Introduction

Chris Ellison An investigation into the density of 'mock blood' Sample A - blood taken from a normal healthy adult male who lives at sea level. Sample B - blood taken from the same male after six months of aerobic exercise. Sample C - blood taken from the same male after training for three months at altitude. Results Time taken for a drop of the sample to fall through 100cm3 of Copper (II) Sulphate Solution. Sample A (Seconds) Sample B (Seconds) Sample C (Seconds) 11.5 12.0 10.0 11.5 13.0 8.0 14.5 12.0 10.0 14.0 12.0 7.5 12.0 13.5 10.0 12.5 14.0 11.0 14.0 16.0 7.0 12.5 12.0 8.5 16.5 14.5 9.5 12.0 11.5 7.5 Mean 13.10 Mean 13.05 Mean 8.5 Now I am going to carry out some statistics on my results to find if they occurred by chance or not. I am going to use the t-test because I need to compare two sets of results that I collected. T-test tables Sample A x x-x (x-x)2 11.5 1.60 2.56 11.5 1.60 2.56 14.5 1.40 1.96 14.0 0.90 0.81 12.0 1.10 1.21 12.5 0.60 0.36 14.0 0.90 0.81 12.5 0.60 0.36 16.5 3.40 11.56 12.0 1.10 1.21 x = 13.10 ? ...read more.

Middle

It also means that is a greater than 0.1 chance that it occurred by chance. This makes sense as my research showed me that aerobic exercise only affects the heart and muscles not the density of the blood. Sample A compared with Sample C The P value for this t-test however is very different. The value was P<0.001, this means there is a difference and that this out come was not reached by chance. If you did this test again the same result would occur 99.9% of the time. Training at altitude can change the density of the blood. The kidney keeps a constant check on the oxygen in the blood as part of homeostasis and when they are low because you are at altitude a hormone is released. This hormone tells the bone marrow to produce more red blood cells. The more red blood cells in your blood the more dense it is and this showed up in our tests. Evaluation I believe that the experiment was accurate enough for the results needed to do our coursework. ...read more.

Conclusion

We used a stopwatch operated by us at eye level with the measuring cylinder. The size of the drop could not be measured either which meant we had variations in that too. The size of the drop would affect the surface area and therefore friction acting upon it; this would slow down the droplet. The shape that was usually a doughnut shape could also change. These are all reasons for my results to be anomalous. To counter some of these problems we could use other equipment or methods. We could use a light gate that works by detecting a break in a beam of light caused by a blob of mock blood falling through the solution. This would greatly improve the accuracy of the results, as would having two people to record and time the results. The main sources of error in the experiment were mainly human error in the fact that the person carrying out the experiment controlled the drop size and timing. Most of the time there weren't any problems with our techniques but errors were still made. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Probability & Statistics 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 AS and A Level Probability & Statistics essays

  1. I am going to design and then carry out an experiment to test people's ...

    12.5 20 11.5 7 7 8 17 17.5 9 7 8 7 10 9 12 7 9 23.5 30 30 21 7 10 16 12 20 22.5 7 11 11 12 8 21.5 7 12 21.5 14 22 21 7 13 11 12 15.5 9 7 14 19.5 19 21

  2. An Investigation In to Human Variation

    Procedures One hundred people (fifty male and fifty female) were sampled in this investigation considering and controlling the variables as listed under 'Variables'. I have increased the number of people sampled from eighty, as stated in the design, to one hundred; a larger sample will give a better representation of

  1. Maths Statistics Investigation

    173 Mazda Premacy 18000 7 14495 4495 69 175 Ford Cougar 10000 5 21980 7985 63.7 177 Mercedes A-Class 80000 2 17787 12320 30.7 183 Hyundai Santa Fe 10000 3 17995 14420 19.9 190 Ford Escort 10000 10 12770 1225 90.4 195 Citroen Berlingo 90000 7 8995 2550 71.7 196

  2. Carrying out an investigation to research the readability of two articles

    Before I start my main investigation I will first conduct a pilot to specify any problems that may occur in the main investigation. Pilot In my pilot I will use an article from 'The Independent' called 'Teen music project wins Philip Lawrence award'.

  1. Statistics Coursework

    87.57 120 92.86 167 96.56 214 99.47 27 78.84 74 87.57 121 93.12 168 96.56 215 99.47 28 79.1 75 87.83 122 93.12 169 96.56 216 99.47 29 79.89 76 87.83 113 93.65 170 96.83 217 99.47 30 79.89 77 87.83 124 93.65 171 96.83 218 99.47 31 80.16 78

  2. Driving test

    To find the how many lessons required to pass the test, I use the formula: Y = mx + c 15 = -0.2118x+22.694 0.2118x = 22.694- 15 x = 7.964/0.2118 x = 37.60 This shows that generally speaking 38 lessons are going to be required in order to pass the test.

  1. Used Cars - What main factor that affects the price of a second hand ...

    the ratio is, 69:89:92 Now to find how this ratio of cars that should be in the sample of 50 cars, Small cars: (50 / 250) x 69 = 13.8 Medium cars: (50 / 250) x 89 = 17.8 Large cars: (50 / 250)

  2. Design an investigation to see if there is a significant relationship between the number ...

    wind and humidity for large durations of time, causing desiccation to occur. Therefore, I would not expect to find many Fucus vesiculosus plants on the upper shore and thus I have opted not to sample it. I am using a form of systematic sampling in my investigation in order to obtain a representative sample.

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