Stats 134 - Spring 2009 - Cheng - Midterm 1 (solution)

Stats 134 - Spring 2009 - Cheng - Midterm 1 (solution) - 1.

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-1- 1. (a)P(sunny predicted sunny) = œ ! Þ ( & P(sunny and predicted sunny) P(predicted sunny) Ð!Þ'ÑÐ!Þ)Ñ Ð!Þ'ÑÐ!Þ)ÑÐ!Þ%ÑÐ!Þ%Ñ (b) P(correct prediction) 0.6 œ Ð ÑÐ!Þ)Ñ  Ð!Þ%ÑÐ!Þ'Ñ œ !(# Answer: P( \   #)!Ñ œ "  Ð Ñ F #)!!Þ&$'&Ð!Þ(#Ñ $'&Ð!Þ(#ÑÐ!Þ#)Ñ È 2 (a) 1 D (b) "BCD 3 (a) (or ) ˆ‰ "! ) ) #! ) # †")†"'†"%†"#†"!†)†' †"*†")†"(†"'†"&†"%†"$ 20 20 (b) (or ) "! * ' ' #! ) 1 # Ð"!†)†(ц")†"'†"%†"#†"!†)
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