Eight data bits and one parity bit form one codeword of an error$-$detecting code: if$,$ at the

receiver, the parity bit does not match the data bits, a request for re$-$transmission of this codeword

is sent to the source.

Assume each bit is received correctly with probability $0\mathrm{.}99,$ independently of other bits. That

is to say, there is a $1\%$ chance that any bit may be incorrectly received $$ including the parity bit.

Define events True Positive, False Positive, True Negative, and False Negative as shown below.

Note that a False Positive event occurs when only the parity bit is received incorrectly: