Statistical Reasoning 90-707
Solutions to Practice Midterm 1

1.  
   1. (iii)
   2. (i), (ii), (iv)
   3. none are quantitative
   4. (iii)
   5. (i)
   6. (ii)
2.  
   1. taking CoQ10 or not
   2. (ii)
   3. migraines (other descriptions, like "headaches", are possible)
   4. (ii)
   5. (i)
3.  
   1. (iv)
   2. (iv)
4.  
   1. (i)
   2. (i)
5. (b)
6.  
   1. (i)
   2. (i)
   3. (ii)
   4. (ii)
   5. (iv)
7.  
   1. mean plus or minus 2 sds: 600 to 1000 g
   2. (iii) Because 884 is only 0.84 standard deviations above the mean, the percentage above must be more than 16\%
   3. mean minus 3 sds: 500 g
   4. z=(740-800)/100=-0.6
   5. (ii) a bit light
8.  
   1. 29/1200=0.024
   2. 50/3000=0.017
   3. (i)
   4. 0.017(1800)=30
   5. (ii)
   6. (i)
9.  
   1. size
   2. 15.9 (the slope)
   3. (vi) 0.83 (positive square root of 0.687)
   4. -141+15.9(40)=495 thousand dollars
   5. 523-495=+28 thousand dollars
   6. S=59.62
   7. (ii)
   8. (i) increase

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