Using parity, the probability for detecting an error, given that one has occurred, is:
A)about 50% for either even or odd parity
B)about 70% for even parity and 30% for odd parity
C)about 30% for even parity and 70% for odd parity
D)about 0% for either even or odd parity
E)about 100% for either even or odd parity

Question

Quizplus · Accepted Answer

Parity checking, whether even or odd, can detect an error only if an odd number of bits are flipped. Since errors can occur in many patterns (odd or even number of bits), the probability of detecting an error is about 50% for both even and odd parity.

Using Parity, the Probability for Detecting an Error, Given That