Some Garbage I Found

The idea of eating yogurt in a forest seems so foreign to me, yet in 2010 an unnamed Colville National Forest visitor downed a Yoplait mixed berry 6 ouncer while driving down the Marias Creek Road between mile markers 1.5 and 2. What possessed this visitor to carelessly fling their discarded yogurt cup out their window into the drainage ditch paralleling the road, I may never know. The discarded cup was found thirteen years later almost completely submerged in dirt and leaf litter. I found this cup while walking back to my rig after a long day of plant surveying along Marias Creek; a lovely little trickle surrounded by downed logs, thorny plants, cow pies, and discarded garbage.   

The yogurt cup in question

I have found garbage all over the forest this summer while conducting plant surveys. Of all the garbage I have found, very few pieces stand out. For every exciting piece; like a license plate, ammunitions crate, hot dog wrapper, or golf club; there is a discarded beer can.

I found this partial license plate near the summit of Mt. Bonaparte. I suspect the owner may have been involved in some illicit activity. Because Tonasket does not have a police department, I may have to take matters into my own hands. 
This ammunitions crate is likely from the Vietnam War-era, when U.S. forces repelled the seldom discussed Vietnamese invasion into North-Central Washington. 
The contents of this hotdog wrapper were nowhere to be found, despite an exhaustive search. 
Golf club found off a forest service road, miles from the nearest course. Someone must have been really mad. 

Beer cans are by far the most abundant pieces of litter in the Colville National Forest. Though, I am sure you are wondering which beer brands are most commonly found discarded in the forest. To answer this question I conducted some statistical analyses. All analyses were done in R (version 4.0.3). Funding for this project was provided by a bank I robbed. 

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Table 1: Raw data of discarded beer can abundance across two areas in the forest. Natty Ice and Natty Light were separated into different brands due to the belief that drinkers of these beers account for two entirely different demographics.

First, I conducted a t-test on the seven most abundant beer brands in the forest. Based on the results of the t-test, Coors was found more frequently than all other beer brands (P<0.05). Other pairwise comparisons were not statistically significant. 

Figure 1:

Results of the t-test. Coors was found significantly more often than other beer brands. 

Next, I used a Tukey p-value adjustment to account for the number of individual tests done. Based on the results of the adjustment, Coors was found significantly more often than Natty Ice, Natty Light, and Rainier (μdiff≠0, with 95% confidence). Other Coors pairwise comparisons were no longer significant.

Figure 2:

Results of the Tukey adjustment, showing that Coors was found significantly more often than Natty Ice, Natty Light, and Rainier. 

Overall, the results of this study show that, when not factoring in differences in beer popularity, Coors drinkers may have a proclivity to discarding their empty beer cans more often than some other beer drinkers, mainly Natty Ice, Natty Light, and Rainier drinkers. More work should be done exploring patterns of beer can disposal in a wider variety of forests.