problem set 1 answers

problem set 1 answers - Answer key for Part II, HW #1 3. 57...

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3. 57 For the yearly salaries of all employees, CV= ( ) 100% = (6 ; 820 = 62 ; 350) 100 = 10 : 94% For the years of experience of these employees, CV= ( ) 100% = (2 = 15) 100 = 13 : 33% The relative variation in salaries is lower than that in years of experience. 3. 81 ± = 2 ; 365 = 340 a. i. ± ± = 1 ; 685 2 ; 365 ± k 340 = 1 ; 685 k = 2 1 ± 1 k 2 = 1 ± 1 2 2 = 1 ± : 25 = : 75 or 75% Thus, at least 75% of all homeowners pay a monthly mortgage of $1,685 to $3045. a. ii. ± ± = 1 ; 345 2 ; 365 ± k 340 = 1 ; 345 k = 3 1 ± 1 k 2 = 1 ± 1 3 2 = 1 ± : 11 = : 89 or 89% Thus, at least 89% of all homeowners pay a monthly mortgage of $1,345 to $5,385. b. 1 ± 1 k 2 = : 84 gives k = 2 : 5 ± ± 2 : 5 = 2 ; 365 ± 2 : 5(340) = $1 ; 515 ± + 2 : 5 = 2 ; 365 + 2 : 5(340) = $3 ; 215 Thus, the required interval is $1,515 to $3,215. 3. 84
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problem set 1 answers - Answer key for Part II, HW #1 3. 57...

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