=+30. More spam. Consider again the points-based spam filter described in Exercise 28. When the points assigned to various components of an e-mail exceed the cutoff value you’ve set, the filter rejects its null hypothesis (that the message is real) and diverts that e-mail to a junk mailbox.

M12_SHAR8696_03_SE_C12.indd 418 14/07/14 7:30 AM Exercises 419