# ch2 - 2(5-1)=9.2/4=2.3 Standard deviation is = 2 3 1 52 b...

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McClave - Chapter 2 – Measures of Central Tendency and Dispersion 2.1 16 0.08 36 0.18 90 0.45 30 0.15 28 0.14 200 1.00 2.33 a. 5+1+3+2+1=12 b. 5 2 +1 2 +3 2 +2 2 +1 2 =40 c. 4+0+2+1+0=7 d. 4 2 +0 2 +2 2 +1 2 +0 2 =21 e.( 5+1+3+2+1) 2 =144 2.41 The sum is 160. The mean is 160/11=14.55 Mode: 15 (appears three times) Sorted: 10 11 12 13 15 15 15 16 17 18 18. The median is number 6: 15. (in bold) 2.54 The sum is 80. The mean is 80/20=4. Sorted: 1 1 1 1 1 2 2 3 3 3 4 4 4 5 5 5 6 7 9 13 Median the average between #10 and #11 (in bold) (3+4)/2=3.5 Mode: 1 (appears 5 times). 2.57 a. range 4-0=4 The mean is (4+2+1+0+1)/5=1.6. The variance is [(4-1.6) 2 +(2-1.6) 2 +1-1.6) 2 +(0-1.6) 2 +(1-1.6)

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Unformatted text preview: 2 ]/(5-1)=9.2/4=2.3 Standard deviation is . = . 2 3 1 52 b. range: 6-0=6 Mean: (1+6+2+2+3+0+3)/7=2.43 Variance: [(1-2.43) 2 +(6-2.43) 2 +(2-2.43) 2 +(2-2.43) 2 +(3-2.43) 2 +(0-2.43) 2 +(3-2.43) 2 )]/6=21.7143/6=3.619 Standard deviation: . = . 3 619 1 90 c. range : 8-(-2)=10 Mean: (8-2+1+3+5+4+4+1+3+3)/10=3 Variance: (5 2 +5 2 +2 2 +0 2 +2 2 +1 2 +1 2 +2 2 +0 2 +0 2 )/9=64/9=7.111 Standard deviation: . = . 7 111 2 67 d. Range: 1-(-3)=4 Mean: -6.8/17=-0.4 Variance: (0.6 2 +0.4 2 +0.4 2 +…+1.4 2 )/16=22.32/16=1.395 Standard deviation: . = . 1 395 1 181...
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ch2 - 2(5-1)=9.2/4=2.3 Standard deviation is = 2 3 1 52 b...

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