For the 835,580 species in the Class Magnoliopsida (Dicotyledons), we average 4.30 observations each in our database; for the Caballera De Palo, we have 391 observations. Compared to other species in this Class, this species is moderately common.
A two-sample t-test can be used to determine whether the trend in observations of the Caballera De Palo is the same as the trend in observations of Magnoliopsida. Is this species just as common, as a proportion of all observations, as it once was? The answer is no, changes in observation rate of this species significantly differ from changes in observation rate of its Class. (t=7.299, p<0.001)
How do observation rates of the Caballera De Palo differ from those of Magnoliopsida? To answer this, we examined the percentage of observerations for Magnoliopsida that were observations of the Caballera De Palo each year. We then correlated this percentage with observation year. If observations of the Caballera De Palo are becoming more common relative to other species of Magnoliopsida, the correlation should be positive, but if it is becoming less common, the correlation should be negative. In fact, the correlation is negative (r=-.54), with a negative slope (m = -.000), suggesting that the Caballera De Palo may be in decline relative to other species of Magnoliopsida. This correlation is statistically significant. (F = 77.72, p<.05)
The scatter chart to the right shows the percentage of all observations for Magnoliopsida each year that were observations of the Caballera De Palo.
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