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

Using the T-test to compare two different populations

Extracts from this document...

Introduction

Using the Student T-test to see if there is any difference by chance alone when comparing two different populations of the same kind. Aim The aim of this investigation was to collect data from two significantly different populations in the measured features. In this case it was the length of the longest leaf from two different fern plants, one population in the sun, and the other which is out of the sun. These data sets will be continues data, after collection the significance in difference will be compared. Hypothesis My hypothesis is that the plants do receive contact with direct sunlight will have longer leaves and the ones that receive less or even non will have much shorter leaves as sun is an important part to plants so they can function and grow. ...read more.

Middle

Controlled The controlled variable would be the type of plant selected. Method The plan written above was used as the method Results The results have been recorded and placed into tables and graphs below. with sun (cm) without sun (cm) 1 41.7 28.2 2 51 30.1 3 55.2 30.4 4 57.9 30.6 5 61.9 31.5 6 62.3 31.9 7 62.5 32.8 8 75.6 33.6 9 76.9 34.9 10 78.2 35.1 11 79.5 35.7 12 79.9 37.4 t-test results Excel 1.58564E-06 Calculator 8.690918212 stand. Dev 12.13945587 2.602829657 Mean (cm) 65.21666667 32.68333333 Range (cm) 38.2 9.2 *In the graph the length is measured in cm. Automatically we can see that there is a large difference between the plants grown with sun to those without sun, so I can conclude that my hypothesis was correct. ...read more.

Conclusion

On the other hand I am happy that I could do most of the work and finish the rest of the calculations, like the student t test, which showed that there was very little chance of the difference in the lengths between the two sets of data being caused by chance alone. Due to the complicated measures and limitations of the same program as before I could not create a bell curved graph to represent the standard deviation but I can conclude that they were pretty significant. Evaluation I thought that the experiment was completed safely and carefully as all the results taken down also included decimals to increase the accuracy. To improve this experiment I think it would be better to grow plants in the laboratory where the conditions would be the same, but one would be in darkness and one would be at a window, both would be watered the same amount too. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Living Things in their Environment 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 GCSE Living Things in their Environment essays

  1. Marked by a teacher

    Research question - Is using dogs for work ethical?

    5 star(s)

    Watson and his partner) we would not be able to experiment on humans. So experimenting on animals would be the only option, and we have to learn how to find facts by trial and error. However, some cosmetics are also tested on animals.

  2. What amounts of vitamin C are in different brands of orange juice.

    2 = 27 Sunny Delight: 34Mg per 100 ml is the amount of vitamin C given by the manufacturer. 34 over 100 as a fraction in its lowest terms is 17 over 50. As a decimal it's 0.34. There is 8.95ml of vitamin C per 10ml.

  1. Estimating the population of non-grass plants on the school fields.

    This was timsing the average number of plants by the area. Really this should have been the number of quadrates on the pitch, but in this case these figures were the same because the quadrates were 1 m2. The area of the rugby pitch is 66* 97= 6402 In this

  2. An Investigation of the Diversity and Abundance of Ground Flora in Coppices of Different ...

    FAIR TEST For the investigation to be mostly fair, we tested out other factors (soil pH, temperature, relative humidity). This helped us ensure that light was the only major difference in abundance and diversity of ground flora in the young and old coppice.

  1. Branded Bleach is more effective at killing E. coli than Non branded bleach - ...

    The phase of the bacteria cell cycle the bacteria are in. It is assumed that the bacteria are in the log phase as the bacteria have been growing for at least three days. If the bacteria aren't in the log phase then the bacteria will grow and die at significantly different rates.

  2. Using the streak plate method, compare the effect of two different brands of toothpaste ...

    Remember to place the piece of agar that has been removed by the cork borer somewhere safe. Next, insert 1cm3 of one of the toothpastes into the hole you will have just made using a sterile syringe. Try and keep the toothpaste as neat as possible in the hole without it spilling over the sides.

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