• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month
Page
1. 1
1
2. 2
2
3. 3
3

# 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

# Related GCSE Living Things in their Environment essays

1. ## Research question - Is using dogs for work ethical?

5 star(s)

Cosmetics have no benefit to our health, and if anything can damage our skin in the long run. Although testing cosmetics on animals had been banned in the UK since 1998, other countries continue this approach to making humans 'more safer'.

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

I then swirled the bacteria around so eventually a thin layer covered the whole dish. After the bacterium was covering the whole plate I sterilised a cork borer by flaming it and then I used it to make the single hole in the centre of the dish.

1. ## The comparison of bacterial content in a range of milks.

results so easily, along with faulty apparatus (different apparatus was used each day-therefore, it could be possible that the results were not entirely accurate). To enable me to compare the difference in the results obtained, I could calculate the percentage errors of each experiment using the following equation: % error

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

There was nothing better then a trundle wheel as well. Also there was no better method of estimating the plants in the school fields then to take sample of the rugby pitch. We would not have enough time to take any more that would represent the rest of the total population.

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

will have different times to react with the bacteria Also over time the phase will change, as if they are still in the log phase their will be more bacteria. Leave in the incubator for the same time 4) Temperature of incubator Temperatures above 25�C encourage rapid bacterial growth which

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

not entirely reach the ground flora and as a result they must compete for it. As there will be very little amounts of light reaching them, many plant species will not be able to photosynthesis and therefore survive. On the other hand it is not just the amount of light

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