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Using the T-test to compare two different populations

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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.

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