Calculate the Mean and Standard Deviation
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Question:
Calculate the mean of both samples - snail shell thickness with crabs and without crabs.
Calculate the standard deviation of both samples - snail shell thickness with crabs and without crabs. Note, these are samples, so you will need to use STDEV.S in excel.
Draw a table to summarise your results. Do not forget to include units.
Which snails have thicker shells? Write a complete sentence and suggest a reason for this finding.
Write a complete sentence to identify which snails' shell thickness is more variable?
Habitat | Thickness (mm) of shells of the snail Littorina obtusata | |||||||||||
With Crabs | 1.02 | 0.88 | 0.75 | 0.94 | 0.81 | 0.98 | 0.79 | 0.83 | 0.86 | 0.93 | 0.91 | 1.05 |
Without Crabs | 0.81 | 0.78 | 0.68 | 0.77 | 0.61 | 0.85 | 0.62 | 0.67 | 0.71 | 0.82 | 0.78 | 0.89 |
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