|
Statistics |
Whelks |
Tomatoes |
Asellus |
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|---|---|---|---|---|---|---|
|
Hypothesis |
There is no difference in the height of shells from sheltered and exposed shores. |
Hand pollinated and sprayed plants set the same amount of fruit. |
Gill movement is not correlated with the oxygen content of the habitat. |
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|
Compared groups |
Sheltered |
Exposed |
Sprayed |
Pollinated |
Stagnant |
Oxygenated |
|
Mean (x) |
30.42 |
20.50 |
46.60 |
57.60 |
49.14 |
44.30 |
|
Standard deviation (s) |
4.87 |
3.09 |
14.30 |
13.52 |
4.45 |
3.23 |
|
Sample size (n) |
12 |
12 |
10 |
10 |
7 |
10 |
|
Standard error (s.e.) |
1.41 |
0.89 |
4.52 |
4.27 |
1.68 |
1.02 |
|
95% confidence limit |
2.81 |
1.78 |
9.04 |
8.55 |
3.36 |
2.05 |
|
Lower 95% confidence interval |
27.60 |
18.72 |
37.56 |
49.05 |
45.78 |
42.25 |
|
Upper 95% confidence interval |
33.23 |
22.28 |
55.64 |
66.15 |
52.51 |
46.35 |
|
t statistic |
5.96 |
1.77 |
2.46 |
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|
Degrees of freedom |
22 |
18 |
15 |
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|
Critical values (tcrit) |
2.07 |
2.10 |
2.13 |
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|
Significant? |
Yes (5.96 > 2.07), sheltered shells are significantly taller. |
No (1.77 < 2.10), sprayed and hand-pollinated plants set the same amount of fruit. |
Yes (2.46 > 2.13), there is more gill activity in stagnant water. |
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