Here we examine the relationship between the slope of a terrain and vegetation, measured by NDVI levels. I used satellite data from Yosemite Valley to analyze and test for statistical significance between NDVI levels amongst different slope angles. I used confidence intervals and hypothesis tests to estimate the population mean NDVI levels. I found statistical significance between the 30-45 degree range and the 75-90 degree range, which supports my hypothesis that lower sloped terrain is more supportive of vegetation. However, my findings show that no slope (even as extreme as 85-90 degrees) prohibits the growth of vegetation completely, and that even the steepest slopes analyzed contained plant life.