  We present one of the first cosmic ray muon flux-angle variation experiments
on the QuarkNet Cosmic Ray Detector (QNCRD). We first describe QNCRD and its
calibration. The main focus is then quantifying muon flux decrease as a
function of angle from the zenith. The angle of counters of QNCRD were
incremented 15 degrees on average every $3.1$ days over the range of 0 degrees
to 90 degrees for a period of approximately one month. Results showed that as
the angle of the detector increased from the zenith, muon flux decreased, which
agrees with previous studies. An estimate for the flux based on the model
$I(\theta)=I_0cos(\theta)^n$ had an exponent value of $n=1.39 \pm 0.01$ for
$\theta < 75$ degrees, an underestimate of values in other literature. These
findings provided a reasonable, although not entirely accurate, estimate for
the value of $n$ considering the duration of the study and sensitivity of the
instrument. Our results constrain the accuracy of QNCRD and provide a source
for future long-term experiments. This study also demonstrates the feasibility
of conducting science experiments in high school classrooms, increasing science
accessibility.
