13) The National Park Service published this side-by-side boxplot after collecting freshwater
samples from six locations (seven samples from each location) within the Allegheny
Portage (ALPO) Railroad National Historic Site.
B) Y
45
40
35
30
25
20
15
10-
5
0
ALPO 1 ALPO 2 ALPO 3 ALPO 4 ALPO 5 ALPO 6
Location
The alkalinity measurement (mgCaCO/L) measures the water's ability to resist changes in
acidity, which is called "buffering capacity." Each boxplot represents seven samples
collected from one of six freshwater stream locations within the park. The dashed line
represents the minimum "buffering capacity for thriving fish life. Which stream locations
have median "buffering capacities below the minimum needed for thriving fish life? Select
all that apply.
a) ALPO 1
d) ALPO 4
b) ALPO 2
e) ALPO 5
c) ALPO 3
f) ALPO 6