st371ss05mt1 - ST371 Tom Gerig 1 ST371 Midterm Examination...

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ST371 Tom Gerig 1 ST371 Midterm Examination I February 9, 2005 Closed book and notes. You may use one sheet of notes (8½ by 11, both sides). You will need a calculator. NAME: ____________________________________ Row #: __________________________________ Before you turn in your examination, please acknowledge that you have received no unauthorized aid by signing and dating the following pledge (from the NCSU Code of Academic Integrity) “I have neither given nor received unauthorized aid on this test or assignment” _____________________________________ _____________________ S i g n a t u r e D a t e
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ST371 Tom Gerig 2 1. Two types of messages are received by an email account on a computer: spam and genuine messages. A spam checker in the computer scores each message as it arrives and labels it indicating that it “appears to be genuine” or “appears to be spam”. Suppose that 40% of all messages received by the computer are spam. Suppose further that 98% of all genuine messages received are labeled as “appears to be genuine”, while 80% of all spam messages are scored as “appears to be spam”. [Use to denote that a message is Spam and use to denote that a message is Labeled as “appears to be spam”.]
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st371ss05mt1 - ST371 Tom Gerig 1 ST371 Midterm Examination...

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