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(Abridged) Despite the great success of precision cosmology, cosmologistscannot fully explain the initial conditions of the Universe. Inflation, anexponential expansion in the first 10^-36s, is a promising potentialexplanation. A generic prediction of inflation is odd-parity (B-mode)polarization in the cosmic microwave background (CMB). The Q/U ImagingExperimenT (QUIET) aimed to limit or detect this polarization.  We built a coherent pseudo-correlation microwave polarimeter. An array ofmass-produced modules populated the focal plane of a 1.4m telescope. Eachmodule had a sensitivity to polarization of 756muK sqrt{s} with a bandwidth of10.7+/-1.1 GHz centered at 94.5+/-0.8 GHz; the combined sensitivity was87+/-7muK sqrt{s}. We incorporated deck rotation, an absorbing ground screen, anew time-stream double-demodulation technique, and optimized optics into thedesign to reduce instrumental polarization. We observed with this instrument atthe Atacama Plateau in Chile between August 2009 and December 2010. Wecollected 5336.9 hours of CMB observation and 1090 hours of astronomicalcalibration.  This thesis describes the analysis and results of these data. Wecharacterized the instrument using the astronomical calibration data as well aspurpose-built artificial sources. We developed noise modeling, filtering, anddata selection following a blind-analysis strategy. Central to this strategywas a suite of 32 null tests, each motivated by a possible instrumental problemor systematic effect. We also evaluated the systematic errors in the blindstage of the analysis before the result was known. We then calculated the CMBpower spectra using a pseudo-Cl cross-correlation technique that suppressedcontamination and made the result insensitive to noise bias.

Measurement of the CMB Polarization at 95 GHz from QUIET