A t-test is used to determine the significance of the difference between two sets of data. In the experimental design snail changes of length and lip increment were measured during increased emersion body temperature conditions. The first t-test recorded differences in fraction of total length added. The second t-test measured increase of lip increment.
The control treatment was at 12 degrees, with two subsequent emersions of 20, and then 28 degrees. There was not statistically significant changes in the first temperature increased treatment. However, in the second, at 28 degrees, there was statistically significant increases in calcification morphology of length and width.
All errors bars represent one SD, and an asterisk (*) indicates that the response treatment mean is significantly different from those of other treatments.
1. For this graph, the research hypothesis tested is:
An increase in emersed body temperature will affect Nucella ostrina morphology.
2. The statistical null hypothesis for the data in the graph is represented by the control temperature of 12 degrees, which is the baseline.
3. The variables presented in the graph are the categories of total length and lip increment.
4. The statistical null hypothesis is rejected as the asterick indicates a significant difference.
5. The research hypothesis is accepted as mean growth in snail mass was significantly higher in the second temperature treatment.
6. The control treatment is 12 degrees.
7. The experimental treatments are 20 and 28 degrees, as described by Yamane & Gilman in their 2009 published report.
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